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On AArch64 it allows use the native FP16 ABI (although libcalls are not emitted for fptrunc/fpext lowering), while on other architectures the expected current semantic is preserved (arm for instance). For testing the _Float16 usage is enabled by architecture base, currently only for arm, aarch64, and arm64. This re-enabled revert done by https://reviews.llvm.org/rGb534beabeed3ba1777cd0ff9ce552d077e496726 Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D92241