[llvm] [SPIRV] Addition of @llvm.lround.* and @llvm.llround.* intrinsic (PR #129240)

[Dmitry Sidorov via llvm-commits]

MrSidims wrote:

@aadeshps-mcw lets avoid squashing and force pushing for the next PRs. It's quite hard to understand, what has changed between previous and current revisions.

https://github.com/llvm/llvm-project/pull/129240