[AMDGPU] Eliminate SGPR to VGPR copy when possible
SGPRs are generally cheaper, so try to use them over VGPRs. Differential Revision: https://reviews.llvm.org/D34130 llvm-svn: 305815
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SGPRs are generally cheaper, so try to use them over VGPRs. Differential Revision: https://reviews.llvm.org/D34130 llvm-svn: 305815