[clang] [Clang][OpenMP] Fix crash with captured pointer-to-VLA in outlined regions (PR #182480)

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Karthikdhondi wrote:

> This fix only handles pointer-to-VLA. It should also handle:
> 
> 1. Direct VLA captures: `int arr[n]`    (this might already be working - can you please check?).
> 2. References to VLAs: `int (&ref)[n]` and `int (&&ref)[n]` (as Aaron mentioned).
> 3. Multidimensional cases: `int (*p)[n][m]`
> 
> Please add test for each scenario.

As noted, Direct VLA captures are already working fine. To ensure the test coverage I have added a testcase for the same. 

https://github.com/llvm/llvm-project/pull/182480