Fixes https://github.com/llvm/llvm-project/issues/55638.

`if consteval` was evaluated incorrectly when in a
non-constant context that could be constant-folded.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D130437

As per P2327R1,

|=, &= and ^= are no longer deprecated in all languages mode.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D130421

5ab6ee75 assumed that if `RValue::isScalar()` returns true then `RValue::getScalarVal` will return a valid value.  This is not the case when the return value is `void` and so void message returns would crash if they hit this path.  This is triggered only for cases where the nil-handling path needs to do something non-trivial (destroy arguments that should be consumed by the callee).

Reviewed By: triplef

Differential Revision: https://reviews.llvm.org/D123898

Just use KnownBits::isZero() to ensure all the bits are known zero.

Noticed while working to remove SelectionDAG::GetDemandedBits - we were relying on the callers to have already bailed for scalable vectors

[DAG] SimplifyDemandedVectorElts - if every and/mul element-pair has a zero/undef then just constant fold to zero

For mask ops like these, the other operand's corresponding element might be zero (result = zero) - so we must demand all the bits and that element.

This appears to be what D128570 was trying to fix - both sides of the funnel shift mask of the vXi64 (legalized to v2Xi32) were incorrectly simplifying the upper 32-bit halves to undef, resulting in bad folds later on.

I intend to address the test case regressions, but this close to the release branch I'd prefer to get a fix in first.

$0 can only be used as a tab stop, not as a placeholder (e.g.
`${0:expression}` is not valid)

Fixes https://github.com/clangd/clangd/issues/1190

Differential Revision: https://reviews.llvm.org/D128621

This reverts commit d534967b.

The patch causes build failures, such as:

https://lab.llvm.org/buildbot/#/builders/121/builds/21760

The declaration was introduced without a corresponding definition on
Sep 7, 2020 in commit f5d07a05.

[libcxx] Remove static inline and make use of _LIBCPP_HIDE_FROM_ABI in __support/xlocale/__nop_locale_mgmt.h header

Reviewed By: ldionne

Differential Revision: https://reviews.llvm.org/D129949

Identified with modernize-use-default-member-init

Fixes llvmorg-15-init-917-g46a6f5ae

Switching to std:array allow us to use fill.

While I am at it, this patch also converts one for loop to a
range-based one.

Following recent changes removing non-core features of the legacy
PM/optimization pipeline.

The last use was removed on Jan 4, 2022 in commit
95a93722.

ArrayRef has operator[], so we don't need to access the contents via
data().

Identified with readability-redundant-control-flow.

to match all other *ISelDAGToDAG.cpp

This patch also drops "&" that binds to a temporary.

Identified with readability-const-return-type.

Identified with modernize-use-default-member-init.

The predicate IsHostAssocited() was implemented in a way that would
return true only for cases of host association into a module or inner
subprogram.  Technically, the use of a name in a BLOCK construct
that is not declared therein is considered in the Fortran standard
to also be a form of host association, and this matters when doing
error checking on DATA statements.

Differential Revision: https://reviews.llvm.org/D130388