[clang] [clang][Builtins] Parse clang extended vectors types. (PR #83584)

[Francesco Petrogalli via cfe-commits]

fpetrogalli wrote:

@philnik777  - thank you for the patch at https://github.com/llvm/llvm-project/pull/68324

I am extending the parser to be able to recognise clang extended vectors.

Thanks!

Francesco

https://github.com/llvm/llvm-project/pull/83584