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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341776 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed