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CopyToReg nodes don't support FrameIndex operands. Other targets select the FI to some LEA-like instruction, but since we don't have that, we need to insert some kind of instruction that can take an FI operand and produces a value usable by CopyToReg (i.e. in a vreg). So insert a dummy copy_local between Op and its FI operand. This results in a redundant copy which we should optimize away later (maybe in the post-FI-lowering peephole pass). Differential Revision: http://reviews.llvm.org/D17213 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260987 91177308-0d34-0410-b5e6-96231b3b80d8
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