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eb1fef0ec1
We must constrain the destination register class of legalized operands to a VGPR class or else the illegal operand may be folded back into the instruction by the register coalescer. This fixes a bug in add.ll that will be uncovered by future commits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217249 91177308-0d34-0410-b5e6-96231b3b80d8
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