Changes

First pass on MLIR python context lifetime management.

* Per thread https://llvm.discourse.group/t/revisiting-ownership-and-lifetime-in-the-python-bindings/1769
* Reworks contexts so it is always possible to get back to a py::object that holds the reference count for an arbitrary MlirContext.
* Retrofits some of the base classes to automatically take a reference to the context, elimintating keep_alives.
* More needs to be done, as discussed, when moving on to the operations/blocks/regions.

Differential Revision: https://reviews.llvm.org/D87886

clangd:  Make ompletionModelCodegen.py tpy2.7 compatible

LLVM still supports Python 2.7, so unbreak bots that still run that.
In a separate commit so that this is easy to revert once we drop
support :)

[gn build] (manually) port 9b6765e784b3

Pre-commit test for CSEing masked loads/stores

[gn build] Do not sync filenames containing variable references

[clang-format] Recognize "hxx" as a C++ header in clang-format-diff.py

And shift "proto" to the next line to avoid a too long line.

Reviewed By: MyDeveloperDay

Differential Revision: https://reviews.llvm.org/D87931

Temporarily Revert "[SLP] Allow reordering of vectorization trees with reused instructions."
as it's infinite looping on occasion.

This reverts commit 455ca0ebb69210046928fedffe292420a30f89ad.

[gn build] (manually) port 9b6765e784b3 more

[gn build] add file i forgot to add in 929d91a55616

[InstSimplify] add tests for constant folding fmin/fmax with undef op; NFC

clang: Make changes in 7c8bb409f31e py2.7-compatible

CompletionModelCodegen: Remove unused import

The unused import is 3.4+, so it also breaks py2.7 compat.
But this is easy to fix :)

[OpenMP] Initial Support for OpenMP Webpage Documentation

Summary:
Adding support for generated html documentation for OpenMP. Changing
Cmake files to build the documentation and adding the base templates for
future documentation to be added.

Reviewers: jdoerfert

Subscribers: aaron.ballman arphaman guansong mgorny openmp-commits sstefan1 yaxunl

Tags: #OpenMP

Differential Revision: https://reviews.llvm.org/D87797

[msan][asan] Add runtime flag intercept_strcmp

Can be used to disable interceptor to workaround issues of
non-instrumented code.

Reviewed By: morehouse, eugenis

Differential Revision: https://reviews.llvm.org/D87897

[llvm-cov] Allow commas in filenames passed to `-object` flag

Currently, -object takes a comma separated list of objects as an
argument, which prevents it working with path names that contain a
comma. Drop comma-separated support, which requires to set pass the
-object flag multiple times to set multiple objects.

Patch by Andrew Gallagher!

Differential Revision: https://reviews.llvm.org/D87003

[COFF] Move per-global .drective emission from AsmPrinter to TLOFCOFF

This changes the order of output sections and the output assembly, but
is otherwise NFC.

It simplifies the TLOF interface by removing two COFF-only methods.

[spirv] Move device info from resource limit into target env

Vendor/device information are not resource limits. Moving to
target environment directly for better organization.

Reviewed By: mravishankar

Differential Revision: https://reviews.llvm.org/D87911

Temporarily Revert "[clangd] Add Random Forest runtime for code completion."
as a header doesn't appear to have made it into the commit.

This reverts commit 9b6765e784b39c88cb8cdb85ab083e6c95a997ed and followup

[test][InstrProf] Fix always_inline.ll under NPM

NPM's inliner does not clean up dead functions.

Differential Revision: https://reviews.llvm.org/D87922

[instcombine][x86] Converted pdep/pext with shifted mask to simple arithmetic

If the mask of a pdep or pext instruction is a shift masked (i.e. one contiguous block of ones) we need at most one and and one shift to represent the operation without the intrinsic. One all platforms I know of, this is faster than the pdep/pext.

The cost modelling for multiple contiguous blocks might be worth exploring in a follow up, but it's not relevant for my current use case. It would almost certainly be a win on AMDs where these are really really slow though.

Differential Revision: https://reviews.llvm.org/D87861

[clang][module] Improve incomplete-umbrella warning

Change the warning message for -Wincomplete-umbrella to report the location of the umbrella header;

Differential Revision: https://reviews.llvm.org/D82118

[clang] Remove profile available check for fsplit-machine-functions.

Enforcing a profile available check in the driver does not work with
incremental LTO builds where the LTO backend invocation does not include
the profile flags. At this point the profiles have already been consumed
and the IR contains profile metadata. Instead we always pass through the
-fsplit-machine-functions flag on user request. The pass itself contains
a check to return early if no profile information is available.

Differential Revision: https://reviews.llvm.org/D87943

[NFC][sanitizer] Don't use ::testing::internal

[lld][WebAssembly] Fix -Wunused-variable after D87663

[PowerPC] Implement Move to VSR Mask builtins in LLVM/Clang

This patch implements the vec_gen[b|h|w|d|q]m function prototypes in altivec.h
in order to utilize the move to VSR with mask instructions introduced in Power10.

Differential Revision: https://reviews.llvm.org/D82725

[GlobalISel] Add lowering support for G_ABS and use for AArch64.

Differential Revision: https://reviews.llvm.org/D87952

[SCEV] Fix an unused variable in -DLLVM_ENABLE_ASSERTIONS=off build

[NFC][Asan] Fix test broken by RegAllocFast

The test worked only because by coincidence register with pointer was
clobbered.
After D52010 value is still preserved.

[NFC][StackSafety] Replace auto with type

Fixes static analyzer is warning.

[AArch64][GlobalISel] Legalize arithmetic ops for <4 x s16>

[AArch64][GlobalISel] Add tests for pre-existing selection support for <4 x s16> arithmetic/bitwise ops.

[NFC][LSan] Add REQUIRES: linux

Additional registers scaning is only implemented for x86 linux.

[LiveDebugValues] Add `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` to suppress -Wunused-function

[llvm-install-name-tool] Validate -id value early

The code which validates the value of -id is moved into the function parseInstallNameToolOptions.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D87855

Temporarily Revert "RegAllocFast: Rewrite and improve"
as it's breaking a few tests in the lldb test suite.

Bot: http://lab.llvm.org:8011/builders/lldb-arm-ubuntu/builds/4226/steps/test/logs/stdio

This reverts commit c8757ff3aa7dd7a25a6343f6ef74a70c7be04325.

[llvm-objcopy][MachO] Add llvm-bitcode-strip driver

This diff adds llvm-bitcode-strip driver to llvm-objcopy.
In the future this will enable us to build a replacement for the tool bitcode_strip.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D87212

Revert "[gn build] (manually) port 9b6765e784b3" anf follow-ups

9b6765e784b3 was reverted in 549e55b3d5634.

This reverts commit 442801a7b9b5460114498c48c12b8af40e495188.
This reverts commit 929d91a55616d4fcf4754044b063644807b87fbe.
This reverts commit 7c2d83347f4ea146af1aca72fe289294aaf212be.

[llvm-objcopy][MachO] Clean up the interface of Object

Remove the method addLoadCommand which was used only in a single place.
NFC.

Test plan: make check-all

[gn build] (manually) port 5495b691646

DebugInfo: Cleanup RLE dumping, using a length-constrained DataExtractor rather than carrying the end offset separately