[PATCH] R600/SI: Fix suspicious indexing

[Matt Arsenault]

The loop is over the operands of an instruction, and checks the
register with the sub reg index of the dest register. This probably
meant to be checking the sub reg index of the same operand.

http://reviews.llvm.org/D6401

Files:
  lib/Target/R600/SIFixSGPRCopies.cpp
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