[PATCH] bug fix for PR20020: anti-dependency-breaker causes miscompilation

[Sanjay Patel]

Thanks, Hal! Updated with assert() and full diff. 

But I now see that this change breaks test/Codegen/X86/atom-sched.ll because that test implicitly enabled -break-anti-dependencies. I'll have to investigate.

http://reviews.llvm.org/D4351

Files:
  lib/CodeGen/CriticalAntiDepBreaker.cpp
  test/CodeGen/X86/pr20020.ll
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