[llvm] [SPIR-V] Implement SPV_KHR_float_controls2 (PR #146941)

[Dmitry Sidorov via llvm-commits]

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

Test adjustment in https://github.com/llvm/llvm-project/pull/146941/commits/fe49f8b223cd23d65b01f12dbf9934a39d28b4bf is LGTM

https://github.com/llvm/llvm-project/pull/146941