[PATCH] R600: Clean if/then/else handling code in AMDILCFGStructurizer

[Vincent Lejeune]

Further simplify the pass and fix some shadertoy's sample crashes.
The pass is no longer able to copy block in the jump into if situation and rely on structurizeCFG pass.

http://llvm-reviews.chandlerc.com/D2188

Files:
  lib/Target/R600/AMDILCFGStructurizer.cpp
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