Changes

[modules] Fix tracking ObjCInterfaceType decl when there are multiple definitions.

With the old approach we were updating `ObjCInterfaceType.Decl` to the
last encountered definition. But during loading modules
`ASTDeclReader::VisitObjCInterfaceDecl` keeps the *first* encountered
definition. So with multiple definitions imported there would be a
disagreement between expected definition in `ObjCInterfaceType.Decl` and
actual definition `ObjCInterfaceDecl::getDefinition` which can lead to
incorrect diagnostic.

Fix by not tracking definition in `ObjCInterfaceType` explicitly but by
getting it from redeclaration chain.

Partially reverted 919fc50034b44c48aae8b80283f253ec2ee17f45 keeping the
modified test case as the correct behavior is achieved in a different
way.

Differential Revision: https://reviews.llvm.org/D110452

BPF: emit BTF_KIND_DECL_TAG for typedef types

If a typedef type has __attribute__((btf_decl_tag("str"))) with
bpf target, emit BTF_KIND_DECL_TAG for that type in the BTF.

Differential Revision: https://reviews.llvm.org/D112259

Modify "statistics dump" to dump JSON.

This patch is a smaller version of a previous patch https://reviews.llvm.org/D110804.

This patch modifies the output of "statistics dump" to be able to get stats from the current target. It adds 3 new stats as well. The output of "statistics dump" is now emitted as JSON so that it can be used to track performance and statistics and the output could be used to populate a database that tracks performance. Sample output looks like:

(lldb) statistics dump
{
  "expressionEvaluation": {
    "failures": 0,
    "successes": 0
  },
  "firstStopTime": 0.34164492800000001,
  "frameVariable": {
    "failures": 0,
    "successes": 0
  },
  "launchOrAttachTime": 0.31969605400000001,
  "targetCreateTime": 0.0040863039999999998
}

The top level keys are:

"expressionEvaluation" which replaces the previous stats that were emitted as plain text. This dictionary contains the success and fail counts.
"frameVariable" which replaces the previous stats for "frame variable" that were emitted as plain text. This dictionary contains the success and fail counts.
"targetCreateTime" contains the number of seconds it took to create the target and load dependent libraries (if they were enabled) and also will contain symbol preloading times if that setting is enabled.
"launchOrAttachTime" is the time it takes from when the launch/attach is initiated to when the first private stop occurs.
"firstStopTime" is the time in seconds that it takes to stop at the first stop that is presented to the user via the LLDB interface. This value will only have meaning if you set a known breakpoint or stop location in your code that you want to measure as a performance test.

This diff is also meant as a place to discuess what we want out of the "statistics dump" command before adding more funcionality. It is also meant to clean up the previous code that was storting statistics in a vector of numbers within the lldb_private::Target class.

Differential Revision: https://reviews.llvm.org/D111686

[gn build] Port d7b338537cf3

Add test to check we can instcombine after reassociate. NFC.

The pattern became optimized after b92412fb286b.

Differential Revision: https://reviews.llvm.org/D112258

Follow-up fixes for aee49255074fd4ef38d97e6e70cbfbf2f9fd0fa7

[libcxx] [test] Add an XFAIL for the timespec test for MinGW targets

MinGW headers/libs lack timespec_get.

Differential Revision: https://reviews.llvm.org/D112213

[libcxx] [test] Add a specific XFAIL for a MinGW env failure that is fixed in Clang 14

This issue only occurs when linked statically in MinGW configurations,
and has been fixed for Clang 14 by https://reviews.llvm.org/D109651.

Differential Revision: https://reviews.llvm.org/D112214

[fir] Remove createConcatenate test temporarily

This test is makeing one buildbot fail for unknown reason. Remove
it until we can investifate further.

[AArch64][GlobalISel] Fold 64-bit cmps with 64-bit adds

G_ICMP is selected to an arithmetic overflow op (ADDS/SUBS/etc) with a dead
destination + a CSINC instruction.

We have a fold which allows us to combine 32-bit adds with G_ICMP.

The problem with G_ICMP is that we model it as always having a 32-bit
destination even though it can be a 64-bit operation. So, we were missing some
opportunities for 64-bit folds.

This patch teaches the fold to recognize 64-bit G_ICMPs + refactors some of
the code surrounding CSINC accordingly.

(Later down the line, I think we should probably change the way we handle G_ICMP
in general.)

Differential Revision: https://reviews.llvm.org/D111088

[mlir][vector] Add patterns to convert multidimreduce to vector.contract

add several patterns that will simplify contraction vectorization in the
future. With those canonicalizationns we will be able to remove the special
case for contration during vectorization and rely on those transformations to
avoid materizalizing broadcast ops.

Differential Revision: https://reviews.llvm.org/D112121

[mlir][linalg] Remove special case for contraction vectorization

Handle contraction op like all the other generic op reductions. This
simpifies the code. We now rely on contractionOp canonicalization to
keep the same code quality.

Differential Revision: https://reviews.llvm.org/D112171

Fix buildbots after https://reviews.llvm.org/D111686

Fix escaping in RewriterGen.cpp.

When we escape strings for C++, make sure we use C++ escape
sequences. (In particular, \x22 instead of \22)

Reviewed By: Mogball

Differential Revision: https://reviews.llvm.org/D112269

[TargetLowering][RISCV] Prevent scalarization of fixed vector bswap.

It's better to do the ands, shifts, ors in the vector domain than
to scalarize it and do those operations on each element.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D112248

Remove unused parallel-libs project

Differential Revision: https://reviews.llvm.org/D112265

Make genAttributeVerifier escape the summary.

The summary can contain references to e.g. attribute defaults, which
can contain special characters. So these strings need to be C++
escaped.

Reviewed By: Mogball

Differential Revision: https://reviews.llvm.org/D112249

[MLIR] Fix FloorDivSIOpConverter that was failing for index type after the arithmetic op refactor

ConstantOp should be used instead of ConstantIntOp to be able to support index type.

Reviewed By: Mogball

Differential Revision: https://reviews.llvm.org/D112191

PR18733: Remove -Wweak-template-vtables

It isn't really pulling its weight and I think splitting it out from
-Wweak-vtables was the wrong call: I think it was just a bug in the
original warning, which was trying to not diagnose template
instantiations, implicit or explicit.

[libcxx] [test] Convert an XFAIL: LIBCXX-WINDOWS-FIXME into XFAIL: msvc with explanation

This test doesn't fail in mingw mode (which uses the same Itanium
name mangling and ABI as other platforms).

Differential Revision: https://reviews.llvm.org/D112210

[modules] Update visibility for merged ObjCInterfaceDecl definitions.

We keep using the first encountered definition and need to take into
account visibility from subsequent definitions. For example, if the
first definition is hidden and the second is visible, we need to make
the first one visible too.

rdar://82263843

Differential Revision: https://reviews.llvm.org/D110453

[InstCombine] Precommit new and-xor-or.ll tests. NFC.

[LegalizeVectorOps][X86] Don't defer BITREVERSE expansion to LegalizeDAG.

By expanding early it allows the shifts to be custom lowered in
LegalizeVectorOps. Then a DAG combine is able to run on them before
LegalizeDAG handles the BUILD_VECTORS for the masks used.

v16Xi8 shift lowering on X86 requires a mask to be applied to a v8i16
shift. The BITREVERSE expansion applied an AND mask before SHL ops and
after SRL ops. This was done to share the same mask constant for both shifts.
It looks like this patch allows DAG combine to remove the AND mask added
after v16i8 SHL by X86 lowering. This maintains the mask sharing that
BITREVERSE was trying to achieve. Prior to this patch it looks like
we kept the mask after the SHL instead which required an extra constant
pool or a PANDN to invert it.

This is dependent on D112248 because RISCV will end up scalarizing the BSWAP
portion of the BITREVERSE expansion if we don't disable BSWAP scalarization in
LegalizeVectorOps first.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D112254

[fir] Remove unused function in CharacterTest

[TargetLowering] Simplify the interface for expandCTPOP/expandCTLZ/expandCTTZ.

There is no need to return a bool and have an SDValue output
parameter. Just return the SDValue and let the caller check if it
is null.

I have another patch to add more callers of these so I thought
I'd clean up the interface first.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D112267