[AMDGPU] Implement IR expansion for frem instruction (#130988) This patch implements a correctly rounded expansion of the frem instruction in LLVM IR. This is useful for target architectures for which such an expansion is too involved to be implement in ISel Lowering. The expansion is based on the code from the AMD device libs and has been tested successfully against the OpenCL conformance tests on amdgpu. The expansion is implemented in the preexisting "expand-fp" pass. It replaces the expansion of "frem" in ISel for the amdgpu target; it is enabled for targets which do not directly support "frem" and for which no matching "fmod" LibCall is available. --------- Co-authored-by: Matt Arsenault <Matthew.Arsenault@amd.com>
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