[llvm] [SPIRV] Emit NonSemantic DebugTypedef (PR #211883)

[Manuel Carrasco via llvm-commits]

mgcarrasco wrote:

LGTM, left some minor comments. Maybe we could merge https://github.com/llvm/llvm-project/pull/211638 first so the helper for the scope caching is available (left also a comment about it in #211638).

https://github.com/llvm/llvm-project/pull/211883