[PATCH] Return undef on conversions that overflow (PR21330).

[Sanjay Patel]

Closed by commit rL219542 (authored by @spatel).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5603

Files:
  llvm/trunk/lib/IR/ConstantFold.cpp
  llvm/trunk/test/Transforms/InstCombine/cast.ll
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