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[AMDGPU] Disallow dpp combining for dpp instructions without Src2 operand (when…

Authored by vpykhtin on Oct 25 2019, 10:42 AM.

Description

[AMDGPU] Disallow dpp combining for dpp instructions without Src2 operand (when Src2 is required)

Differential revision: https://reviews.llvm.org/D69430