[PATCH] [SCEV] Refactor out isHighCostExpansion. NFCI.

[Sanjoy Das]

Hi bogner, atrick,

Move isHighCostExpansion from IndVarSimplify to SCEVExpander.  This
exposed function will be used in a subsequent change.

http://reviews.llvm.org/D8995

Files:
  include/llvm/Analysis/ScalarEvolutionExpander.h
  lib/Analysis/ScalarEvolutionExpander.cpp
  lib/Transforms/Scalar/IndVarSimplify.cpp

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