[clang] [Clang] Permit noescape on non-pointer types (PR #117344)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

>  I'd like to see a test that validates this changes with these types.

Sorry, I missed the part in CodeGen. So `noescape` is used to emit the `nocapute` parameter attribute in the LLVM IR. This parameter attribute is only valid for pointers and we currently do not seem to have a way in the LLVM IR to express nocapture for a field of a struct.

I changed the PR to make sure we do not emit `nocapture` in the IR where we should not and added some tests validating this. 

https://github.com/llvm/llvm-project/pull/117344