Three transforms (all commutative):
https://alive2.llvm.org/ce/z/Bc-nh4

Closes #71309

Recommit "[DAGCombiner] Transform `(icmp eq/ne (and X,C0),(shift X,C1))` to use rotate or to getter constants." (2nd Try)

Added missing check that the mask and shift amount added up to correct
bitwidth as well as test cases for the bug.

Closes #71729

This combine was previously adding instruction in some cases (see the
tests).

Closes #72767

Alive2: https://alive2.llvm.org/ce/z/gqeaVo

Related patch:
https://github.com/llvm/llvm-project/commit/31d219d2997fed1b7dc97e0adf170d5aaf65883e

This allows us to also check the constraints during constant evaluation.

This reverts commit 99ee2db1.

It's causing ICEs in the ARM tests. See the comment here:

https://github.com/llvm/llvm-project/commit/99ee2db198d86f685bcb07a1495a7115ffc31d7e

I swore I copied the if statement from somewhere, but whatever I did to
it while moving it over dropped one of the equals signs. This patch
fixes that so the action will actually work properly.

Currently, the scorecard action runs on forks. This means that every
recent fork will be periodically running a job that doesn't really make
a lot of sense to run outside the main monorepo. This patch fixes that
by restricting the job to only run in the monorepo.

/llvm-project/clang/lib/CodeGen/CGObjCGNU.cpp:3674:15: error: variable 'selStructPtrTy' set but not used [-Werror,-Wunused-but-set-variable]
  llvm::Type *selStructPtrTy = SelectorTy;
              ^
1 error generated.

* Replace all existing uses of ConstantAggregateBuilderBase::addBitCast,
  as they involve a no-op ptr-to-ptr bitcast
* Remove method ConstantAggregateBuilderBase::addBitCast

Opaque ptr cleanup effort (NFC)

This patch extends findDbgValue and friends to optionally fill out a vector
of DPValue pointers, containing DPValues that refer to the sought Value.
This will allow us to incrementally add instrumentation to other
optimisation passes one-at-a-time, while un-instrumented passes will not
(yet) update DPValues.

Unit tests to check this behaves in the same way as dbg.values.

Replace calls to `ConstantAggregateBuilderBase::addBitCast` that involve a
no-op ptr-to-ptr bitcast.

Opaque ptr cleanup effort (NFC)

Revert rGbfbfd1ca "[X86] combineLoad - try to reuse existing constant pool entries for smaller vector constant data"

Investigating reports of this causing infinite loops

ShrinkDemandedOp checks for both isTruncateFree AND isZExtFree but extends with ANY_EXTEND.

VPReductionRecipe may be executed for scalar VFs. Make sure to access
part 0 of the condition, as it could be an active-lane-mask, which is a
vector <1 x i1>

Fixes https://github.com/llvm/llvm-project/issues/72720.

Address post-commit comment to retain comment.

Currently, when changes are made to the tablegen files that build the
docs, the docs build is not tested. This should rarely cause breakages,
but it's cheap to test and there isn't a major reason not to.

Method CGObjCGNUstep2::EnforceType is called from 2 call-sites to perform
bitcasts which are no-ops given that opaque pointers are enabled in LLVM.

Remove the method. Opaque ptr cleanup effort (NFC).

Add -rv32 -rv64 as suffix to test name. First step towards trying
to merge the content of these tests.

There's already a Contents field in the MCEncodedFragmentWithFixups
base class. The Contents field in MCLEBFragment is private and there
is no accessor for it. It is initialized in the constructor, but that
should probably initialize the base class version.

When performing constant folding on the affineApplyOp, there is a
division of 0 in the affine map.
[related issue](https://github.com/llvm/llvm-project/issues/64622

)

---------

Co-authored-by: Javier Setoain <jsetoain@users.noreply.github.com>

This is a follow-up to #68981, and fix for #72630, #72447.

We may end up in SelectionDAG::salvageDebugInfo() with indirect debug
values, and attempting to salvage ADD nodes with non-constant RHS would
lead us to try to turn those indirect debug values variadic, which is
not allowed.

This triggered the following assert in the SDDbgValue constructor:

  Assertion `!(IsVariadic && IsIndirect)' failed.

This also adds a lit test for salvaging when having an indirect debug
value and constant RHS, as there seems like there was no such lit test.
However, I am not sure if the use of the stack_value operation is
correct in that case (which is existing behavior before #68981), but
that at least documents the current behavior.

Enable Type Units with DWARF5 accelerator tables for monolithic DWARF.
Implementation relies on linker to tombstone offset in LocalTU list to
-1 when
it deduplciates type units using COMDAT.