[PATCH] Fix for bug 21725: wrong results with union and strict-aliasing

[Jeroen Dobbelaere]

Hi hfinkel, dberlin,

Generate path-aware tbaa for unions. This fixes an aliasing issue described in bug 21725.

http://reviews.llvm.org/D8056

Files:
  lib/CodeGen/CGExpr.cpp                                            
  lib/CodeGen/CodeGenTBAA.cpp                                  
  test/CodeGen/tbaa-union.cpp

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