[llvm] [SPIR-V] Fix emission of debug and annotation instructions and add SPV_EXT_optnone SPIR-V extension (PR #118402)

[Dmitry Sidorov via llvm-commits]

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

SPV_EXT_optnone changes are lgtm

https://github.com/llvm/llvm-project/pull/118402