[clang] [clang][CodeGen] Fix assertion failure for new T[SIZE_MAX] with array cookie (PR #232570)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve2-vla-2stage` running on `arm-bbot-clang-aarch64-sve2-vla-2stage` while building `clang` at step 12 "ninja check 2".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/199/builds/11291

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

```
Step 12 (ninja check 2) failure: stage 2 checked (failure)
******************** TEST 'AddressSanitizer-Unit :: ./Asan-aarch64-calls-Noinst-Test/11/16' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/buildbot/workspace/clang-aarch64-sve2-vla-2stage/stage2/runtimes/runtimes-bins/compiler-rt/lib/asan/tests/AARCH64LinuxConfig/./Asan-aarch64-calls-Noinst-Test-AddressSanitizer-Unit-3765163-11-16.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=16 GTEST_SHARD_INDEX=11 /home/buildbot/workspace/clang-aarch64-sve2-vla-2stage/stage2/runtimes/runtimes-bins/compiler-rt/lib/asan/tests/AARCH64LinuxConfig/./Asan-aarch64-calls-Noinst-Test
--

Script:
--
/home/buildbot/workspace/clang-aarch64-sve2-vla-2stage/stage2/runtimes/runtimes-bins/compiler-rt/lib/asan/tests/AARCH64LinuxConfig/./Asan-aarch64-calls-Noinst-Test --gtest_filter=AddressSanitizer.ThreadedQuarantineTest
--
/home/buildbot/workspace/clang-aarch64-sve2-vla-2stage/llvm/compiler-rt/lib/asan/tests/asan_noinst_test.cpp:188: Failure
Expected equality of these values:
  0
  pthread_create(&t, __null, ThreadedQuarantineTestWorker, 0)
    Which is: 11


/home/buildbot/workspace/clang-aarch64-sve2-vla-2stage/llvm/compiler-rt/lib/asan/tests/asan_noinst_test.cpp:188
Expected equality of these values:
  0
  pthread_create(&t, __null, ThreadedQuarantineTestWorker, 0)
    Which is: 11



********************


```

</details>

https://github.com/llvm/llvm-project/pull/232570