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[RISCV] Add intrinsics for vfwmacc, vfwnmacc, vfwmsac, vfwnmsac instructions

Authored by arcbbb on Dec 22 2020, 5:30 AM.

Description

[RISCV] Add intrinsics for vfwmacc, vfwnmacc, vfwmsac, vfwnmsac instructions

This patch defines vfwmacc, vfwnmacc, vfwmsc, vfwnmsac intrinsics
and lower to V instructions.
We work with @rogfer01 from BSC to come out this patch.

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

Differential Revision: https://reviews.llvm.org/D93693