[llvm] [AArch64] Add clmul AArch64 lowering tests (PR #179495)

[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-5` 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/35703

<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)
...
UNSUPPORTED: mlgo-utils :: corpus/make_corpus_script.test (89363 of 89372)
UNSUPPORTED: mlgo-utils :: corpus/make_corpus_test.py (89364 of 89372)
UNSUPPORTED: mlgo-utils :: pytype.test (89365 of 89372)
PASS: lld :: MinGW/lib.test (89366 of 89372)
PASS: lld :: MachO/arm64-thunks.s (89367 of 89372)
PASS: lld :: MachO/loh-adrp-ldr-got-ldr.s (89368 of 89372)
PASS: lld :: MachO/loh-adrp-ldr.s (89369 of 89372)
PASS: lld :: MachO/loh-adrp-add.s (89370 of 89372)
PASS: lld :: MinGW/driver.test (89371 of 89372)
TIMEOUT: Clangd Unit Tests :: ./ClangdTests/8/11 (89372 of 89372)
******************** TEST 'Clangd Unit Tests :: ./ClangdTests/8/11' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/tools/clang/tools/extra/clangd/unittests/./ClangdTests-Clangd Unit Tests-51523-8-11.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=11 GTEST_SHARD_INDEX=8 /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/tools/clang/tools/extra/clangd/unittests/./ClangdTests
--

Note: This is test shard 9 of 11.
[==========] Running 123 tests from 80 test suites.
[----------] Global test environment set-up.
[----------] 1 test from ClangdAST
[ RUN      ] ClangdAST.PreferredIncludeDirective
Built preamble of size 716912 for file /clangd-test/TestTU.m version null in 0.01 seconds
Built preamble of size 717596 for file /clangd-test/TestTUHeader.h version null in 0.01 seconds
Built preamble of size 717596 for file /clangd-test/TestTUHeader.h version null in 0.01 seconds
Built preamble of size 717456 for file /clangd-test/TestTUHeader.h version null in 0.01 seconds
[       OK ] ClangdAST.PreferredIncludeDirective (54 ms)
[----------] 1 test from ClangdAST (54 ms total)

[----------] 1 test from BackgroundIndexTest
[ RUN      ] BackgroundIndexTest.ShardStorageEmptyFile
Enqueueing 1 commands for indexing
Failed to load shard: /clangd-test/root/A.cc
Indexing /clangd-test/root/A.cc (digest:=CF02BBB58E041F61)
Indexed /clangd-test/root/A.cc (4 symbols, 5 refs, 3 files)
BackgroundIndex: building version 1 when background indexer is idle
BackgroundIndex: serving version 1 (24424 bytes)
Enqueueing 1 commands for indexing
BackgroundIndex: building version 1 after loading index from disk
BackgroundIndex: serving version 1 (24424 bytes)
Enqueueing 1 commands for indexing
BackgroundIndex: building version 1 after loading index from disk
BackgroundIndex: serving version 1 (24424 bytes)
Indexing /clangd-test/root/A.cc (digest:=CF02BBB58E041F61)
Indexed /clangd-test/root/A.cc (1 symbols, 1 refs, 3 files)
BackgroundIndex: building version 2 when background indexer is idle
BackgroundIndex: serving version 2 (35372 bytes)
[       OK ] BackgroundIndexTest.ShardStorageEmptyFile (12 ms)
[----------] 1 test from BackgroundIndexTest (12 ms total)


```

</details>

https://github.com/llvm/llvm-project/pull/179495