[clang] [clang] Reject references to vector types in `__builtin_vectorelements` (PR #219767)

[Akash Manna via cfe-commits]

akash-manna-sky wrote:

> I think we can move these test to `builtin_vectorelements.cpp` that we not need to create a new one

Moved the tests into `builtin_vectorelements.cpp` and removed the separate file.

https://github.com/llvm/llvm-project/pull/219767