[clang] Diagnose potential size confusion with VLA params [contd.] (PR #181550)

[Yeoul Na via cfe-commits]

rapidsna wrote:

> Note that this confusion in principle applies to any use of any identifier, not just constants but also others in sizeof / typeof.

Per @uecker's comment: I assume the current implementation already warns these cases since we use `ConstDynamicRecursiveASTVisitor`, but we need to add more tests. @ak1932 could you please add more tests similar to below? 

```C
int a[10];
void foo(int arr[sizeof(a)], int a[16]); // warning
```

https://github.com/llvm/llvm-project/pull/181550