clang: Define FP_FAST_FMA_HALF macro for AMDGPU OpenCL specifies this should be defined if cl_khr_fp16 is implemented and half fma is fast compared to a separate mul and add. This is trivially true for all targets with native half support. It's not true for targets without half support which need to legalize by promotion to double. We already lie about this though, for the convenience of the dummy default target.
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