[llvm] [X86][APX] Do optimizeMemoryInst for v1X masked load/store (PR #151331)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-armv8-quick` running on `linaro-clang-armv8-quick` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/154/builds/19558

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'Clangd Unit Tests :: ./ClangdTests/76/165' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/tools/clang/tools/extra/clangd/unittests/./ClangdTests-Clangd Unit Tests-1686115-76-165.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=165 GTEST_SHARD_INDEX=76 /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/tools/clang/tools/extra/clangd/unittests/./ClangdTests
--

Note: This is test shard 77 of 165.
[==========] Running 8 tests from 8 test suites.
[----------] Global test environment set-up.
[----------] 1 test from LSPTest
[ RUN      ] LSPTest.FeatureModulesThreadingTest
[       OK ] LSPTest.FeatureModulesThreadingTest (8 ms)
[----------] 1 test from LSPTest (8 ms total)

[----------] 1 test from CompletionStringTest
[ RUN      ] CompletionStringTest.GetDeclCommentBadUTF8
Built preamble of size 341332 for file /clangd-test/TestTU.cpp version null in 0.03 seconds
[       OK ] CompletionStringTest.GetDeclCommentBadUTF8 (67 ms)
[----------] 1 test from CompletionStringTest (67 ms total)

[----------] 1 test from IncludeFixerTest
[ RUN      ] IncludeFixerTest.NoCrashMemberAccess
Built preamble of size 341332 for file /clangd-test/TestTU.cpp version null in 0.01 seconds
[       OK ] IncludeFixerTest.NoCrashMemberAccess (19 ms)
[----------] 1 test from IncludeFixerTest (19 ms total)

[----------] 1 test from FuzzyMatch
[ RUN      ] FuzzyMatch.Matches
[       OK ] FuzzyMatch.Matches (7 ms)
[----------] 1 test from FuzzyMatch (7 ms total)

[----------] 1 test from ParameterHints
[ RUN      ] ParameterHints.VariadicReferenceHint
Built preamble of size 341172 for file /clangd-test/TestTU.cpp version null in 0.02 seconds
[       OK ] ParameterHints.VariadicReferenceHint (39 ms)
[----------] 1 test from ParameterHints (39 ms total)

[----------] 1 test from CrossFileRenameTests
[ RUN      ] CrossFileRenameTests.WithUpToDateIndex
ASTWorker building file /clangd-test/foo.h version null with command 
[/clangd-test]
clang -xobjective-c++ /clangd-test/foo.h
Driver produced command: cc1 -cc1 -triple armv8a-unknown-linux-gnueabihf -fsyntax-only -disable-free -clear-ast-before-backend -main-file-name foo.h -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -target-cpu generic -target-feature +read-tp-tpidruro -target-feature +vfp2 -target-feature +vfp2sp -target-feature +vfp3 -target-feature +vfp3d16 -target-feature +vfp3d16sp -target-feature +vfp3sp -target-feature +fp16 -target-feature +vfp4 -target-feature +vfp4d16 -target-feature +vfp4d16sp -target-feature +vfp4sp -target-feature +fp-armv8 -target-feature +fp-armv8d16 -target-feature +fp-armv8d16sp -target-feature +fp-armv8sp -target-feature -fullfp16 -target-feature +fp64 -target-feature +d32 -target-feature +sha2 -target-feature +aes -target-feature -fp16fml -target-feature +neon -target-abi aapcs-linux -mfloat-abi hard -debugger-tuning=gdb -fdebug-compilation-dir=/clangd-test -fcoverage-compilation-dir=/clangd-test -resource-dir lib/clang/22 -internal-isystem lib/clang/22/include -internal-isystem /usr/local/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -ferror-limit 19 -fno-signed-char -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fobjc-runtime=gcc -fobjc-encode-cxx-class-template-spec -fobjc-exceptions -fcxx-exceptions -fexceptions -no-round-trip-args -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -x objective-c++ /clangd-test/foo.h
Building first preamble for /clangd-test/foo.h version null
Built preamble of size 420384 for file /clangd-test/foo.h version null in 0.12 seconds
indexed preamble AST for /clangd-test/foo.h version null:
  symbol slab: 0 symbols, 68 bytes
  ref slab: 0 symbols, 0 refs, 72 bytes
  relations slab: 0 relations, 12 bytes
indexed file AST for /clangd-test/foo.h version null:
...

```

</details>

https://github.com/llvm/llvm-project/pull/151331