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LLVMCoverage: Unify getCoverageForFile and getCoverageForFunction. NFC (#120842)

Since #119952, `getCoverageForFile` and `getCoverageForFunction` have
similar structure each other. Ther merged method `addFunctionRegions`
has two lambda subfunctions.

* `getCoverageForFile`
  - `MainFileID` may be `nullopt`.
- `shouldProcess` picks up relevant records along `FileIDs` that is
scanned based on `MainFileID`. They may have expanded source files.
  - `shouldExpand` takes the presense of `MainFileID` into account.
* `getCoverageForFunction`
  - This assumes the presense of `MainFileID`.
  - `shouldProcess` picks up records that belong only to `MainFileID`.
  - `shouldExpand` assumes the presense of `MainFileID`.

This change introduces a wrapper class `MergeableCoverageData` for
further merging instances. At the moment, this returns `CoverageData`
including `buildSegments()`.

This change itself is NFC.

[mlir][Bytecode] Fix infinite loop by tracking type/attribute in deferred worklist (#174874)

The bytecode reader could enter an infinite loop when parsing deeply
nested attributes containing type references. The deferred worklist
stored only indices without distinguishing between attributes and types,
causing type indexes to be misinterpreted as attributes.

This patch changes the deferred worklist to store pairs of (index, kind)
to track whether each deferred entry is a type or attribute. The
worklist processing logic is updated to resolve the correct entry type.

[mlir][Python] downcast ir.Value to BlockArgument or OpResult

[CIR] Upstream support for data member comparison (#171897)

This adds support for handling data member pointer comparisons in CIR.

[Coverage] Make additional counters available for BranchRegion. NFC. (#120930)

`getBranchCounterPair()` allocates an additional Counter to SkipPath in
`SingleByteCoverage`.

`IsCounterEqual()` calculates the comparison with rewinding counter
replacements.

`NumRegionCounters` is updated to take additional counters in account.

`incrementProfileCounter()` has a few additiona arguments.

- `UseSkipPath=true`, to specify setting counters for SkipPath. It
assumes `UseSkipPath=false` is used together.

- `UseBoth` may be specified for marking another path. It introduces the
same effect as issueing `markStmtAsUsed(!SkipPath, S)`.

`llvm-cov` discovers counters in `FalseCount` to allocate `MaxCounterID`

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[CFIInserter] Improve `CSRSavedLocation` struct. (#168869)

(1) Define `CSRSavedLocation::Kind` and use it in the code. This makes
the code more readable and allows to extend it to new kinds. For
example, soon I want to add "scalable offset from a given register"
kind.

(2) Store the contents in a union. This should reduce memory usage.

Rename wasm32-wasi to wasm32-wasip1. (#165345)

This adds code to recognize "wasm32-wasip1", "wasm32-wasip2", and
"wasm32-wasip3" as explicit targets, and adds a deprecation warning when
the "wasm32-wasi" target is used, pointing users to the "wasm32-wasip1"
target.

Fixes #165344.

I'm filing this as a draft PR for now, as I've only just now proposed to
make this change in #165344.

[clang-doc] Move navbar and sidebar into normal document flow (#175110)

The navbar and sidebar caused spacing and alignment issues since they
were fixed elements with defined height/width. It was difficult to have
all elements below them correctly offset the height. This patch changes
them
to sticky elements within the normal document flow that don't define
their
height/width explicitly. This actually lets us use existing HTML/CSS
properties (like the "content" div) more naturally.

This also changes the navbar behavior to not follow while scrolling.

add tests

use forward decl

[libc][wctype] Upstream enumerate header from PtrHash-cc prototype to LLVM libc

[libc][wctype] Upstream immintrin storage from PtrHash-cc prototype to LLVM libc

[libc][wctype] Upstream fastrand from PtrHash-cc prototype to LLVM libc

work around for no cpp::pair

fix extension

[libc][wctype] Upstream StdRng from PtrHash-cc prototype to LLVM libc

fix nesting

remove used once functions

[CIR][X86] Add support for `cpuid`/`cpuidex` (#173197)

Adds support for the `__builtin_ia32_cpuid` and `__builtin_ia32_cpuidex`
X86 builtins.

Part of [167765](https://github.com/llvm/llvm-project/issues/167765).

[CIR] Upstream handling for data member pointer casts (#171950)

This adds the CIR basic handling for casts of data member pointers. Cast
to bool and null, as well as member function pointer casts will be
handled in followup PRs.

[flang][cuda] Update cuda data transfer rules for full managed assigment (#175243)

[SLP]Update deps for copyables operands, if the user is used several times in node

If the user instruction is used several times in the node, and in one
cases its operand is copyable, but in another is not, need to check all
operands to be sure we do not miss scheduling

[BOLT] Add aaupov to X86 maintainers list

Minor NFC refactor/cleanup.

Update RST files.

Add clang codegen test.

[Clang][OpenMP] Initial codegen changes for `use_device_ptr(fb_nullify)`.

[AMDGPU] Fix AMDGPULowerKernelAttributes not invalidating analysis (#175256)

Summary:
The new PM wasn't using the changed result which triggered failures
after https://github.com/llvm/llvm-project/pull/174112

[mlir][Python] downcast ir.Value to BlockArgument or OpResult

Update test checks to incorporate Parsing/Sema changes.