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Move a transformation routine from LoopUtils to LoopVectorize.

Description

Move a transformation routine from LoopUtils to LoopVectorize.

Summary:
Move InductionDescriptor::transform() routine from LoopUtils to its only uses in LoopVectorize.cpp.
Specifically, the function is renamed as InnerLoopVectorizer::emitTransformedIndex().

This is a child to D51153.

Reviewers: dmgreen, llvm-commits

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D51837

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