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Summary: For shrinking SOPK instructions, we were creating a hint to tell the register allocator to use the register allocated for src0 for the dst operand as well. However, this seems to not work sometimes depending on the order virtual registers are assigned physical registers. To fix this, I've added a second allocation hint which does the reverse, asks that the register allocated for dst is used for src0. Reviewers: arsenm Subscribers: arsenm, llvm-commits, kzhuravl Differential Revision: https://reviews.llvm.org/D23862 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279968 91177308-0d34-0410-b5e6-96231b3b80d8