[AMDGPU] SDWA: remove omod src operand for VOP2b instructions

Summary: VOP2b instructions (v_subbrev_u32, v_add_i32 ...) shouldn't support OMod operand in SDWA encoding

Reviewers: rampitec, dp

Subscribers: arsenm, kzhuravl, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye

Differential Revision: https://reviews.llvm.org/D40172

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318761 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed