[PATCH] Improve sqrt estimate algorithm

[Sanjay Patel]

Closed by commit rL219445 (authored by @spatel).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5682

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/test/CodeGen/PowerPC/recipest.ll
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