[AMDGPU] Assembler: support v_mac_f32 DPP and SDWA. Move getNamedOperandIdx to AMDGPUBaseInfo.h

Reviewers: artem.tamazov, tstellarAMD

Subscribers: arsenm, kzhuravl, wdng, nhaehnle, yaxunl, tony-tye

Differential Revision: https://reviews.llvm.org/D25084

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283560 91177308-0d34-0410-b5e6-96231b3b80d8
11 files changed