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[LV] Don't allow outside uses of IVs if the SCEV is predicated on loop…

Authored by mkuper on Jul 12 2017, 12:53 PM.

Description

[LV] Don't allow outside uses of IVs if the SCEV is predicated on loop conditions.

This fixes PR33706.
Differential Revision: https://reviews.llvm.org/D35227

llvm-svn: 307837