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[AMDGPU] Split dot2-insts feature

Authored by foad on Mar 16 2021, 9:01 AM.

Description

[AMDGPU] Split dot2-insts feature

Split out some of the instructions predicated on the dot2-insts target
feature into a new dot7-insts, in preparation for subtargets that have
some but not all of these instructions. NFCI.

Differential Revision: https://reviews.llvm.org/D98717

Details