[clang] [OFFLOAD] Add headers to support complex math for spirv (PR #179846)

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fineg74 wrote:

> Are these substantially different from the ones we already have? Also in theory the build I have of `compiler-rt` is a better solution for this. Only reason I haven't told people to move to that is because building with compiler-rt enabled is a chore because of CMake constantly re-running

No they are not, they just use spirv API for implementation. I was not sure if SPIRV backend implements all the intrinsics. If it does it could be done with less changes by sharing existing code

https://github.com/llvm/llvm-project/pull/179846