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If a PHI defines AGPR legalize its operands to AGPR. At the moment we can get an AGPR PHI with VGPR operands. I am not aware of any problems as it seems to be handled gracefully in RA, but this is not right anyway. It also slightly decreases VGPR pressure in some cases because we do not have to a copy via VGPR. Differential Revision: https://reviews.llvm.org/D69206 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375446 91177308-0d34-0410-b5e6-96231b3b80d8
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