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[libcxx] Optimize `ranges::fold_left_with_iter` for segmented iterators (#177853)

Part of https://github.com/llvm/llvm-project/issues/102817.

This patch attempts to optimize the performance of
`ranges::fold_left_with_iter` for segmented iterators.

- before

```
# | rng::fold_left(vector<int>)/8             2.78 ns         2.78 ns    241953718
# | rng::fold_left(vector<int>)/32            12.2 ns         12.2 ns     57579851
# | rng::fold_left(vector<int>)/50            19.2 ns         19.2 ns     36487764
# | rng::fold_left(vector<int>)/8192          3226 ns         3226 ns       216811
# | rng::fold_left(vector<int>)/1048576     441842 ns       441839 ns         1592
# | rng::fold_left(deque<int>)/8              2.83 ns         2.83 ns    243888678
# | rng::fold_left(deque<int>)/32             16.6 ns         16.6 ns     42297458
# | rng::fold_left(deque<int>)/50             22.3 ns         22.3 ns     31387998
# | rng::fold_left(deque<int>)/8192           2492 ns         2492 ns       281637

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[libc][math] Resolve size issues on baremetal and cleanup code. (#179707)

[X86] Fixed truncated masked stores (#179853)

Fixes: #179489

Comment

getter / iterator via interface

[DebugInfo] Add macro tracking support to DebugInfoFinder

Extend DebugInfoFinder to collect and expose macro debug information
(DIMacro and DIMacroFile nodes).

Also update ModuleDebugInfoPrinter to display macro information including
the macro type, name, value, and source location.

getter / iterator via interface

[llvm][ADT] Mark scope_exit contructors [[nodiscard]] (#179720)

[AMDGPU][PromoteAlloca] Set !amdgpu.non.volatile if promotion fails

I thought about doing this in a separate pass, but this pass already has all the necessary analysis for this to be a trivial addition.
We can simply set `!amdgpu.non.volatile`  if all other attempts to promote the operation failed.

Rename to MOThreadPrivate

Pull metadata impl at the top of the patch stack

fix test

Fix test merge

Fix test

Clean up upgrade test

Address comments

Add C API to set this

Commented out code

Address comments

LangRef whitespace

bar syntax and only print input if different from output.

Breaks update_test_checks Function Attrs comment check in the rare
case where the modes mismatch.

Documentation examples

XXX - syntax change

Fix links in documentation

remove raw

Revert "XXX - syntax change"

This reverts commit 1336cd4e7d2754ea5eddf2a43c1f66c615ea40ff.

IR: Promote "denormal-fp-math" to a first class attribute

Convert "denormal-fp-math" and "denormal-fp-math-f32" into a first
class denormal_fpenv attribute. Previously the query for the effective
deormal mode involved two string attribute queries with parsing. I'm
introducing more uses of this, so it makes sense to convert this
to a more efficient encoding. The old representation was also awkward
since it was split across two separate attributes. The new encoding
just stores the default and float modes as bitfields, largely avoiding
the need to consider if the other mode is set.

The syntax in the common cases looks like this:
  `denormal_fpenv(preservesign,preservesign)`
  `denormal_fpenv(float: preservesign,preservesign)`
  `denormal_fpenv(dynamic,dynamic float: preservesign,preservesign)`

I wasn't sure about reusing the float type name instead of adding a
new keyword. It's parsed as a type but only accepts float. I'm also
debating switching the name to subnormal to match the current

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[VectorCombine] Fix crash in foldEquivalentReductionCmp on i1 vector (#179917)

[ARM][clang] Add some build attributes support (#161106)

"unsafe-fp-math" and related function attribites will be removed in
future, let frontend generate some hints for ARM backend to generate ABI
tags.

[flang][OpenMP][DoConcurrent] Emit declare mapper for records

Extends `do concurrent` device support by emitting compiler-generated
declare mapper ops for live-ins whose types are record types and have
allocatable members.