[llvm] [SPIRV] Added opencl Pipe builtins (PR #135335)

[Dmitry Sidorov via llvm-commits]

https://github.com/MrSidims commented:

Thanks! I hope to go through the code to check compliance with SPIR-V spec not later, then mid of next week. Meanwhile, can we make the test shorter? This is applicable to other PRs.

https://github.com/llvm/llvm-project/pull/135335