[clang] Fix crash with invalid VLA in a type trait (PR #138543)

[via cfe-commits]

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@@ -287,6 +287,8 @@ Non-comprehensive list of changes in this release
   stack space when running on Apple AArch64 based platforms. This means that
   stack traces of Clang from debuggers, crashes, and profilers may look
   different than before.
+- Fixed a crash when a VLA with an invalid size expression was used within a
+  ``sizeof`` or ``typeof`` expression. #GH138444
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cor3ntin wrote:

```suggestion
  ``sizeof`` or ``typeof`` expression. (#GH138444)
```

https://github.com/llvm/llvm-project/pull/138543