[PATCH] Make the sqrt intrinsic return undef for a negative input.

[Sanjay Patel]

Closed by commit rL218803 (authored by @spatel).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5527

Files:
  llvm/trunk/lib/Analysis/ConstantFolding.cpp
  llvm/trunk/test/Transforms/InstCombine/constant-fold-math.ll
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