[AMDGPU] gfx11 CodeGen for new DPP instructions

Modifies the GCNDPPCombine pass to enable DPP formation for the new DPP
instruction in gfx11, namely VOP3 encoded instructions with DPP and VOPC
with DPP.

Depends on D128656

Reviewed By: #amdgpu, rampitec

Differential Revision: https://reviews.llvm.org/D128682