Fix ScalarEvolutionExpander step scaling bug
The expandAddRecExprLiterally function incorrectly transforms
`[Start + Step * X]` into `Step * [Start + X]` instead of the correct
transform of `[Step * X] + Start`.
This caused https://github.com/JuliaLang/julia/issues/14704#issuecomment-
174126219
due to what appeared to be sufficiently complicated loop interactions.
Patch by Jameson Nash (jameson@juliacomputing.com).
Reviewers: sanjoy
Differential Revision: http://reviews.llvm.org/D16505
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275239
91177308-0d34-0410-b5e6-
96231b3b80d8
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