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

[Wei Mi]

I updated the patch to enable aggressive exit value rewriting if the loop can be deleted after the rewrite.

Thanks,
Wei.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9800

Files:
  lib/Analysis/ScalarEvolutionExpander.cpp
  lib/Transforms/Scalar/IndVarSimplify.cpp
  test/Transforms/IndVarSimplify/exit_value_test2.ll
  test/Transforms/IndVarSimplify/exit_value_test3.ll
  test/Transforms/IndVarSimplify/exit_value_tests.ll
  test/Transforms/IndVarSimplify/lcssa-preservation.ll
  test/Transforms/IndVarSimplify/loop_evaluate_1.ll
  test/Transforms/IndVarSimplify/loop_evaluate_6.ll

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