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[RISCV] Add intrinsics for vf[n]macc/vf[n]msac/vf[n]madd/vf[n]msub instructions

Authored by arcbbb on Dec 22 2020, 4:50 AM.

Description

[RISCV] Add intrinsics for vf[n]macc/vf[n]msac/vf[n]madd/vf[n]msub instructions

This patch defines vfmadd/vfnmacc, vfmsac/vfnmsac, vfmadd/vfnmadd,
and vfmsub/vfnmsub lower to V instructions.

Authored-by: Roger Ferrer Ibanez <rofirrim@gmail.com>
Co-Authored-by: ShihPo Hung <shihpo.hung@sifive.com>

Differential Revision: https://reviews.llvm.org/D93691