[llvm] [msan] Add avx512-intrinsics.ll and avx512-intrinsics-upgrade.ll test case (PR #123980)

[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/13521

<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 'LLVM :: Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll -S -mtriple=x86_64-linux-gnu -mattr=+avx512f -passes=msan 2>&1 | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/opt /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll -S -mtriple=x86_64-linux-gnu -mattr=+avx512f -passes=msan
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll:3861:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[Q:%.*]] = load i64, ptr [[PTR_B:%.*]], align 8
              ^
<stdin>:3290:3: note: scanning from here
4: ; preds = %0
  ^
<stdin>:3295:3: note: possible intended match here
 %_msld = load i64, ptr %7, align 4
  ^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll:3896:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[Q:%.*]] = load i64, ptr [[PTR_B:%.*]], align 8
              ^
<stdin>:3320:3: note: scanning from here
6: ; preds = %0
  ^
<stdin>:3325:3: note: possible intended match here
 %_msld = load i64, ptr %9, align 4
  ^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll:3938:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[Q:%.*]] = load i64, ptr [[PTR_B:%.*]], align 8
              ^
<stdin>:3357:3: note: scanning from here
5: ; preds = %0
  ^
<stdin>:3362:3: note: possible intended match here
 %_msld = load i64, ptr %8, align 4
  ^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll:4144:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[Q:%.*]] = load i64, ptr [[PTR_B:%.*]], align 8
              ^
<stdin>:3536:3: note: scanning from here
4: ; preds = %0
  ^
<stdin>:3541:3: note: possible intended match here
 %_msld = load i64, ptr %7, align 4
  ^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/Instrumentation/MemorySanitizer/X86/avx512-intrinsics-upgrade.ll:4179:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[Q:%.*]] = load i64, ptr [[PTR_B:%.*]], align 8
              ^
<stdin>:3566:3: note: scanning from here
6: ; preds = %0
  ^
...

```

</details>

https://github.com/llvm/llvm-project/pull/123980