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RVD extension is a double-precision floating-point instruction-set extension, which adds double-precision floating-point computational instructions compliant with the IEEE 754-2008 arithmetic standard. This patch: - Reuse most of the functions in the "F extension" to impl the"D extension" - corresponding unittests. Reviewed By: DavidSpickett Differential Revision: https://reviews.llvm.org/D140032