Changes

[DWARF][test] Test all the call-site realted attrs
Adding the test for the call site encoding in DWARF5 vs GNU extensions. 
Some of the attributes were not covered by any test.
Differential Revision: https://reviews.llvm.org/D73266

[Format] Fix 'auto x(T&&, T &&)->F' with PAS_Left.
Summary: An heuristic targetting `x && x->foo` was targed overly broadly
and caused the last T&& to be treated as a binary operator.
Reviewers: hokein
Subscribers: cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D73334

[clang][NFC] Remove redundant cast
This cast just casts Decl* to Decl*.

[X86] Add test showing failure to remove vector rotate of allsignbits
Rotating an 0/-1 value by any amount will always result in the same 0/-1
value

[clangd] Errors in TestTU cause test failures unless suppressed with
error-ok.
Summary: The historic behavior of TestTU is to gather diagnostics and
otherwise ignore them. So if a test has a syntax error, and doesn't
assert diagnostics, it silently misbehaves. This can be annoying when
developing tests, as evidenced by various tests gaining "assert no
diagnostics" where that's not really the point of the test.
This patch aims to make that default behavior. For the first error
(not warning), TestTU will call ADD_FAILURE().
This can be suppressed with a comment containing "error-ok". For now
that will suppress any errors in the TU. We can make this stricter later
-verify style.
(-verify itself is hard to reuse because of DiagnosticConsumer
interfaces...) A magic-comment was chosen over a TestTU option because
of table-driven tests.
In addition to the behavior change, this patch:
 - adds //error-ok where we're knowingly testing invalid code
   (e.g. for diagnostics, crash-resilience, or token-level tests)
 - fixes a bunch of errors in the checked-in tests, mostly trivial
(missing ;)
 - removes a bunch of now-redundant instances of "assert no diagnostics"
Reviewers: kadircet
Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, usaxena95,
cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D73199

[NFC][ARM] Make some params members instead.
Add MachineLoopInfo and ReachingDefAnalysis as members of 
LowOverheadLoop instead of passing them several times to different 
methods.

[doc][llvm-objcopy] Remove redundant COFF-specific sub-heading
The sub-heading used to contain the --only-keep-debug switch as that 
switch wasn't implemented for ELF at one point. Since the switch is now 
in the generic options section, and there are no other options in this 
sub-heading, it is pointless and can be deleted.

[mlir] Use all_of instead of a manual loop in IntrinsicGen. NFC
This was suggested in post-commit review of D72926.

[llvm-libc] Add memory function benchmarks
Summary: This patch adds a benchmarking infrastructure for llvm-libc
memory functions.
In a nutshell, the code can benchmark small and large buffers for the
memcpy, memset and memcmp functions. It also produces graphs of size vs
latency by running targets of the form
`render-libc-{memcpy|memset|memcmp}-benchmark-{small|big}`.
The configurations are provided as JSON files and the benchmark also
produces a JSON file. This file is then parsed and rendered as a PNG
file via the `render.py` script (make sure to run `pip3 install
matplotlib scipy numpy`). The script can take several JSON files as
input and will superimpose the curves if they are from the same host.
TODO:
- The code benchmarks whatever is available on the host but should be
configured to benchmark the -to be added- llvm-libc memory functions.
- Add a README file with instructions and rationale.
- Produce scores to track the performance of the functions over time to
allow for regression detection.
Reviewers: sivachandra, ckennelly
Subscribers: mgorny, MaskRay, libc-commits
Tags: #libc-project
Differential Revision: https://reviews.llvm.org/D72516

[SelectionDAG] rot(x, y) --> x iff ComputeNumSignBits(x) == BitWidth(x)
Rotating an 0/-1 value by any amount will always result in the same 0/-1
value

[lldb][NFC] Delete unused ClangASTImporter::CompleteDecl

[lldb][NFC] Fix formatting in ASTImporterDelegate::ImportImpl

[AArch64][SVE] Add intrinsics for FFR manipulation
Summary: Implements the following intrinsics:
 - llvm.aarch64.sve.setffr
 - llvm.aarch64.sve.rdffr
 - llvm.aarch64.sve.rdffr.z
 - llvm.aarch64.sve.wrffr
Reviewers: sdesmalen, efriedma, dancgr, rengolin
Reviewed By: efriedma
Subscribers: tschuett, kristof.beyls, hiraditya, rkruppe, psnobl,
cameron.mcinally, cfe-commits, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D73097

[NFC][ARM] Add test

[lldb] Fix nondeterminism in TestCppBitfields
The test was printing a char[3] variable without a terminating nul. The 
memory after that variable (an unnamed bitfield) was not initialized. If 
the memory happened to be nonzero, the summary provider for the variable 
would run off into the next field.
This is probably not the right behavior (it should stop at the end of 
the array), but this is not the purpose of this test. I have filed 
pr44649 for this bug, and fixed the test to not depend on this behavior.

[lldb/DWARF] Remove a workaround from DebugNamesDWARFIndex
This was needed when asking a compile unit for its dwo component 
triggered a infinite recursion if the dwo unit has not been already 
parsed.
This has since been fixed.

[X86][SSE] Add shufps+shufps test for fold through commutation
As mentioned on D73023, lowerShuffleWithSHUFPS should be able to commute
the shufps inputs to fold the second arg as it will then permute the
shufps result anyway.

[clangd] Show background index status using LSP 3.15 work-done progress
notifications
Summary: It simply shows the completed/total items on the background
queue, e.g.
indexing: 233/1000 The denominator is reset to zero every time the queue
goes idle.
The protocol is fairly complicated here (requires creating a remote
"progress" resource before sending updates). We implement the full
protocol, but I've added an extension allowing it to be skipped to
reduce the burden on clients - in particular the lit test takes this
shortcut.
The addition of background index progress to DiagnosticConsumer seems
ridiculous at first glance, but I believe that interface is trending in
the direction of
"ClangdServer callbacks" anyway. It's due for a rename, but otherwise
actually fits.
Reviewers: kadircet, usaxena95
Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, jfb,
cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D73218