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[aarch64] Add combine patterns for fp16 fmla

Authored by sebpop on Sep 7 2019, 1:24 PM.

Description

[aarch64] Add combine patterns for fp16 fmla

This patch enables generation of fused multiply add/sub for instructions operating on fp16.
Tested on aarch64-linux.

Differential Revision: https://reviews.llvm.org/D67297

llvm-svn: 371321