[clang] [clang]: support std::meta::info for primitive types (PR #190356)

[Nhat Nguyen via cfe-commits]

changkhothuychung wrote:

> As a scalar, meta::info should be usable as template parameter / argument - do you have tests for that?

Let me add tests for that in the upcoming pushes. 

https://github.com/llvm/llvm-project/pull/190356