[llvm] [SPIRV] Addition of extension SPV_KHR_non_semantic_info and SPV_KHR_relaxed_extended_instruction (PR #165302)

[Dmitry Sidorov via llvm-commits]

https://github.com/MrSidims commented:

Overall looks good. As of now I'm checking metadata to SPIR-V lowering correctness.

First set of comments, dedicated just to DebugInfoNone

https://github.com/llvm/llvm-project/pull/165302