[llvm] [SPIRV] Legalize Cast Instructions for Matrix Types (PR #212619)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/46884

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang-Unit :: ./AllClangUnitTests/28/54' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/Volumes/RAMDisk/buildbot-root/aarch64-darwin/build/tools/clang/unittests/./AllClangUnitTests-Clang-Unit-11351-28-54.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=54 GTEST_SHARD_INDEX=28 /Volumes/RAMDisk/buildbot-root/aarch64-darwin/build/tools/clang/unittests/./AllClangUnitTests
--

Note: This is test shard 29 of 54.
[==========] Running 503 tests from 102 test suites.
[----------] Global test environment set-up.
[----------] 1 test from MinimizeSourceToDependencyDirectivesTest
[ RUN      ] MinimizeSourceToDependencyDirectivesTest.UnderscorePragma
[       OK ] MinimizeSourceToDependencyDirectivesTest.UnderscorePragma (0 ms)
[----------] 1 test from MinimizeSourceToDependencyDirectivesTest (0 ms total)

[----------] 1 test from LexerTest
[ RUN      ] LexerTest.GetSourceTextExpandsInMacroArgumentForBeginOfMacro
[       OK ] LexerTest.GetSourceTextExpandsInMacroArgumentForBeginOfMacro (0 ms)
[----------] 1 test from LexerTest (0 ms total)

[----------] 1 test from PPCallbacksTest
[ RUN      ] PPCallbacksTest.AngledInMacro
[       OK ] PPCallbacksTest.AngledInMacro (0 ms)
[----------] 1 test from PPCallbacksTest (0 ms total)

[----------] 1 test from ParseHLSLRootSignatureTest
[ RUN      ] ParseHLSLRootSignatureTest.InvalidDescriptorTableClauseParamTest
[       OK ] ParseHLSLRootSignatureTest.InvalidDescriptorTableClauseParamTest (0 ms)
[----------] 1 test from ParseHLSLRootSignatureTest (0 ms total)

[----------] 1 test from ToolChainTest
[ RUN      ] ToolChainTest.BadConfigFile
[       OK ] ToolChainTest.BadConfigFile (0 ms)
[----------] 1 test from ToolChainTest (0 ms total)

[----------] 1 test from DependencyScanningWorkerFilesystem
[ RUN      ] DependencyScanningWorkerFilesystem.ConcurrentSameUIDDifferentFilenamesDeduplicatesOpen
[       OK ] DependencyScanningWorkerFilesystem.ConcurrentSameUIDDifferentFilenamesDeduplicatesOpen (1 ms)
[----------] 1 test from DependencyScanningWorkerFilesystem (1 ms total)

[----------] 2 tests from ExprMutationAnalyzerTest
[ RUN      ] ExprMutationAnalyzerTest.BindingDoesNotModify
input.cc:1:68: warning: expression result unused [-Wunused-value]
    1 | struct Point { int x; int y; };void f(Point p) { auto& [x, y] = p; x; }
      |                                                                    ^
[       OK ] ExprMutationAnalyzerTest.BindingDoesNotModify (2 ms)
[ RUN      ] ExprMutationAnalyzerTest.UniquePtr
input.cc:1:301: warning: expression result unused [-Wunused-value]
    1 | template <class T> struct UniquePtr {  UniquePtr();  UniquePtr(const UniquePtr&) = delete;  UniquePtr(UniquePtr&&);  UniquePtr& operator=(const UniquePtr&) = delete;  UniquePtr& operator=(UniquePtr&&);  T& operator*() const;  T* operator->() const;};struct S { int v; };void f() { UniquePtr<S> x; x->v; }
      |                                                                                                                                                                                                                                                                                                          ~~~^
input.cc:1:307: warning: expression result unused [-Wunused-value]
...

```

</details>

https://github.com/llvm/llvm-project/pull/212619