[PATCH] [Polly][Fix] Dead memory accesses should not confuse RTC generation

[Johannes Doerfert]

Hi grosser, sebpop, dpeixott, simbuerg,

  This fixes http://llvm.org/bugs/show_bug.cgi?id=21166 .

http://reviews.llvm.org/D5623

Files:
  lib/Analysis/ScopInfo.cpp
  test/ScopInfo/aliasing_dead_access.ll
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