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Previously, only -1 and +1 step values are supported for induction variables. This patch extends LV to support arbitrary constant steps. Initial patch by Alexey Volkov. Some bug fixes are added in the following version. Differential Revision: http://reviews.llvm.org/D6051 and http://reviews.llvm.org/D7193 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227557 91177308-0d34-0410-b5e6-96231b3b80d8