[PATCH] Enable ExitValue rewrite only when expansion cost is low.

[Wei Mi]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9800

Files:
  llvm/trunk/lib/Analysis/ScalarEvolutionExpander.cpp
  llvm/trunk/lib/Transforms/Scalar/IndVarSimplify.cpp
  llvm/trunk/test/Transforms/IndVarSimplify/exit_value_test2.ll
  llvm/trunk/test/Transforms/IndVarSimplify/exit_value_test3.ll
  llvm/trunk/test/Transforms/IndVarSimplify/lcssa-preservation.ll

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