Changes

[gn build] Port 36080434a885

[libc++] Add documentation for reproducing CI issues locally

Differential Revision: https://reviews.llvm.org/D142566

[extract_symbols.py] Filter out more symbols for MSVC

This strips out about 5k symbols.

Fixes https://github.com/llvm/llvm-project/issues/60109

Reviewed By: john.brawn

Differential Revision: https://reviews.llvm.org/D142431

[Support] Remove findFirstSet and findLastSet

This patch removes findFirstSet and findLastSet as there are no uses
left in LLVM.

I am not aware of any uses of findFirstSet and findLastSet in the
open-source world outside LLVM, so I am skipping the deprecation step.

Differential Revision: https://reviews.llvm.org/D142603

[RISCV] Add MC support of RISCV Zcb Extension

This patch add the instructions of Zcb extension.

Instructions in zcb extensions shorten part of bit manipulation instructions.

Co-authored-by: Craig Topper <craig.topper@sifive.com>

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D131141

Reland: [llvm-cov] Look up object files using debuginfod

Reviewed By: gulfem

Differential Revision: https://reviews.llvm.org/D136702

[LinkerWrapper] Fix `-Bsymbolic` being sent to the compiler and not the linker

Summary:
Clang doesn't warn on `-B` options passed to it. This one is not
forwarded to the linker which results in some tests failing when
offloading to x86_64 with the `bfd` linker.

[OpenMP][OMPIRBuilder]Move SIMD alignment calculation to LLVM Frontend

Currently default simd alignment is defined by Clang specific TargetInfo class.
This class cannot be reused for LLVM Flang. That's why default simd alignment
calculation has been moved to OMPIRBuilder which is common for Flang and Clang.

Previous attempt: https://reviews.llvm.org/D138496 was wrong because
the default alignment depended on the number of built LLVM targets.

If we wanted to calculate the default alignment for PPC and we hadn't specified
PPC LLVM target to build, then we would get 0 as the alignment because
OMPIRBuilder couldn't create PPCTargetMachine object and it returned 0 as
the default value.

If PPC LLVM target had been built earlier, then OMPIRBuilder could have created
PPCTargetMachine object and it would have returned 128.

Differential Revision: https://reviews.llvm.org/D141910

Reviewed By: jdoerfert

[SYCL] Fix test to conform to SYCL2020

[mlir][Linalg] Adding a greedy packing transform dialect op.

This PR adds a `pack_greedily` transform operation that infers the packing for gemm
subcomputations embedded within in any LinalgOp and packs accordingly.
A normalization step guarantees that we get the innermost op dimensions in one of `8`
possible `(m, n, k)` orders, specified as a parameter, from which we can emit all
packed forms.

The current implementation takes an arbitrary LinalgOp and tries to pack it along
the specified dimensions with specified sizes and inner dim permutation.

This achieves a new level of normalization and generalization for any `n-D`
LinalgOp that contains a gemm embedded within it:
we will always see a predictable packed form for any of these ops.

Differential Revision: https://reviews.llvm.org/D142661

[flang] Fixed uninitialized std::unique_ptr dereference.

This fixes unittest failures reported in D142279:
  flang-Unit :: Frontend/./FlangFrontendTests/5/7
  flang-Unit :: Frontend/./FlangFrontendTests/6/7

[flang] Fixed restrictions checking for OpenACC loop-associated constructs.

CheckDoConcurrentClauseRestriction and CheckTileClauseRestriction expect
that the construct has associated DoConstruct, while it is not set
when the do-loop has no loop control. The change is to skip the clauses
checks, when the do-loop does not have the loop control.

An alternative fix would be to associate the DoConstruct even when
the do-loop has no loop control and let Check*ClauseRestriction run their
checks, but I am not sure if associating invalid DoConstruct is a good idea.

This fixes failure in Semantics/OpenACC/acc-canonicalization-validity.f90
reported in D142279.

Reviewed By: clementval

Differential Revision: https://reviews.llvm.org/D142652

[bazel] Add missing dependency after 55cf0de35e

[test][lldb-vscode] Fix unclean shutdown in test_terminate_commands

This test manually sends `terminateCommands` to shutdown, but then the test attempts another `terminateCommands` request in test tear down, which fails since it's already torn down. This error is ignored in LLDB's old fork of unittest2, but will be reported as a test failure in `unittest` from the Python standard library. Use `disconnectAutomatically` to avoid terminating twice.

test-release.sh: Use parallel xz for packaging the binaries

Reviewed By: amyk, dim, hans

Differential Revision: https://reviews.llvm.org/D142417