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[libcxx] Do not mark mkstemp tests xfail for libc (#203681)

mkstemp was recently implemented in
c9b25a6437fd97fdb1e55ab6661c0cccce98913e, so these tests now pass.

[Passes] Remove redundant IR pass registries in MachinePassRegistry.def (#203659)

IR pass registries are redundant, remove them.

[clang-tidy] Avoid non-const-parameter fix-it conflicts with overloads (#202490)

`readability-non-const-parameter` can suggest changing `T *` to `const T
*` when that would conflict with an existing overload. Suppress the
diagnostic in that case by comparing the post-fix parameter list against
other declarations with the same name.

Closes https://github.com/llvm/llvm-project/issues/202478

[Xtensa] Implement support of the ESP32S2 target. (#200130)

[OpenACC] Fix scope setup for OpenACC directives without scope. (#203687)

When implementing these, I intended to have the 'empty' parse scopes for
most of the directives introduced for simplicity. However some
assertions show that this is not a valid use of this, as it doesn't
tolerate 'empty' parse scopes. This patch stops introducing one.

Fixes: #203679

Merge branch 'main' into users/jofrn/x86-remove-shouldcastatomicloadinir-v2

[AtomicExpand][test] Add CHECK32 and CHECK64 via whole-file regen (#201303)

Add CHECK32 and CHECK64 via whole-file regen for the
`@load_v2i64_cmpxchg`, `@load_v4i32_cmpxchg`, `@load_v16i8_cmpxchg`
tests of https://github.com/llvm/llvm-project/pull/199310.

Stacked below https://github.com/llvm/llvm-project/pull/199520.

Reapply "[lit] Deprecate execute_external=True in ShTest" (#203316) (#203689)

This reverts commit 6713634507b21efe6c895dd40e85ba72fe0ce269.

The fuzzer tests now use the internal shell by default, so we should be
good to go ahead and enable this.

[AMDGPU] gfx1251 cost model (#203682)

[SPIR-V] Preserve pointer-to-pointer element type for T*& parameters (#203113)

SPIR-V backend was collapsing T*& reference parameters down to T*,
dropping a level of indirection during element-type deduction. This
patch keeps the pointer-to-pointer level intact, fixing it both within a
function (a T** reloaded from its alloca) and across calls via
cross-function parameter propagation.

Fixes HeCBench/topk on HIP.

[Clang][NFC] Add the list C++ papers approved in Brno by WG21 (#203685)

[AMDGPU] gfx1251 cost model

Use clang to canonicalize the triple

Use clang to canonicalize the triple

fix: add braces to metadata translation conditionals

[mlir-tblgen] Render enum keyword alternatives in generated attr/type docs

When mlir-tblgen generates documentation for AttrDefs/TypeDefs that have
EnumParameter fields, it previously rendered the raw C++ type (e.g.
`::mlir::ns::MyEnum`) in the syntax block. This was unhelpful for
users who need to know the valid keyword values.

This patch:
1. Adds an `EnumInfo enum = enumInfo;` field to the `EnumParameter`
   TableGen class, persisting the enum record for tooling to inspect.
2. Modifies `emitAttrOrTypeDefAssemblyFormat` in OpDocGen.cpp to detect
   EnumParameter fields and render their cases as backtick-quoted
   alternatives (e.g. `` `read` | `read_write` ``).
3. Adds a test case to gen-dialect-doc.td verifying the new behavior.

Before:
  #my_dialect.my_attr<
    int32_t,   # index
    ::mlir::ns::MyEnum,   # access

    [9 lines not shown]

[libc++] LWG3767: `codecvt<charN_t, char8_t, mbstate_t>` incorrectly added to locale (#201749)

Implement it as a DR against C++20, patching P0482R6.

[orc-rt] Add ORC_RT_C_NOTHROW and apply it to the Error C API. (#203674)

Adds an ORC_RT_C_NOTHROW macro that expands to `noexcept` in C++ mode,
and `__attribute__((nothrow))` where that attribute is supported.

Also applies the new ORC_RT_C_NOTHROW macro to orc-rt-c/Error.h (and
adds `noexcept` to the corresponding C++ implementation in
lib/executor/Error.cpp).

[CIR][OpenCL] Lower kernel argument metadata to LLVM IR

Translate CIR OpenCL kernel argument metadata into the LLVM IR kernel_arg_* metadata attached to kernel functions. Preserve optional argument names so -cl-kernel-arg-info controls the LLVM metadata surface through the CIR attribute.

[orc-rt] Merge ExternC.h and Visibility.h into Compiler.h. (#203673)

This mirrors the combined orc-rt/Compiler.h header on the C++ side, and
provides a natural home for future decoration macros when they're added.

[CIR][OpenCL] Attach kernel argument metadata to CIR functions

Emit the CIR OpenCL kernel argument metadata attribute for kernel functions. Preserve CIR language address-space kinds until lowering and include argument names only when `-cl-kernel-arg-info` is enabled.

Updated tests because of liveins/liveouts seeding.

Regenerated tests after rebasing.

[AMDGPU] Adjusted GCN tracker option after rebasing on top of
users/dhruvachak/add_physical_to_gcn_trackers_after_rename.

[AMDGPU] Regenerated tests after rebasing.

[AMDGPU] Regenerated tests after rebasing on top of
users/dhruvachak/add_physical_to_gcn_trackers_after_rename.

[AMDGPU] Enabled GCN trackers (amdgpu-use-amdgpu-trackers) by default.

The LIT tests have been generally updated in one of the following ways:
(1) If the above option was not present and the test was auto-generated,
the test has now been auto-generated.
(2) If the above option was not present and the test was not
auto-generated, added the option -amdgpu-use-amdgpu-trackers=0 so as to
preserve any specific attributes the test was already checking.
(3) If the above option was present in a test, then its value has been
updated to reflect the change in the default.

Currently, there are 4 tests in category (2). They are:
CodeGen/AMDGPU/
  addrspacecast.ll
  schedule-regpressure-limit.ll
  schedule-regpressure-limit2.ll
  sema-v-unsched-bundle.ll

There are 8 tests in category (3). They are:

    [15 lines not shown]

clang-format.

Updated tests because of liveins/liveouts seeding.

[AMDGPU] Regenerated tests after rebasing.