[PATCH] D13716: [IndVars] Split `WidenIV::cloneIVUser`; NFC

[Sanjoy Das via llvm-commits]

sanjoy created this revision.
sanjoy added reviewers: atrick, hfinkel, reames.
sanjoy added a subscriber: llvm-commits.

This NFC splitting is intended to make a later diff easier to follow.
It just tail duplicates `cloneIVUser` into `cloneArithmeticIVUser` and
`cloneBitwiseIVUser`.

http://reviews.llvm.org/D13716

Files:
  lib/Transforms/Scalar/IndVarSimplify.cpp

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