Move common loop utility function isInductionPHI into LoopUtils.cpp

This patch refactors the definition of common utility function "isInductionPHI" to LoopUtils.cpp.
This fixes compilation error whe

Move common loop utility function isInductionPHI into LoopUtils.cpp

This patch refactors the definition of common utility function "isInductionPHI" to LoopUtils.cpp.
This fixes compilation error when configured with -DBUILD_SHARED_LIBS=ON

llvm-svn: 235577

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[NFC] Refactor identification of reductions as common utility function.
This patch refactors reduction identification code out of LoopVectorizer and
exposes them as common utilities.
No functional ch

[NFC] Refactor identification of reductions as common utility function.
This patch refactors reduction identification code out of LoopVectorizer and
exposes them as common utilities.
No functional change.
Review: http://reviews.llvm.org/D9046

llvm-svn: 235284

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