[clang] [AMDGPU][Clang] Support for type inferring extended image builtins for AMDGPU (PR #164358)

[Juan Manuel Martinez Caamaño via cfe-commits]

https://github.com/jmmartinez approved this pull request.

It's ok for me. I wish we didn't have to add the `e` case, but I do not see an easy way out.

Maybe we should think about moving the builtins to tablegen as it's done for RISCV.

https://github.com/llvm/llvm-project/pull/164358