[PATCH] R600/SI: Fix assertion from copying a TargetGlobalAddress

[Matt Arsenault]

Assert in scheduler from an inserted copy_to_regclass from
a constant.
   
This only seems to break sometimes when a constant initializer
address is forced into VGPRs in a non-entry block. No test
since the only case I've managed to hit only happens with a future
patch, and that case will also not be a problem once SGPRs are
used in non-entry blocks.

http://reviews.llvm.org/D5235

Files:
  lib/Target/R600/SIISelLowering.cpp
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