[PATCH] [ValueTracking] Fix PR23011.

[Nadav Rotem]

Nick, Sanjoy,

I am sorry for the bug. Thanks for catching and fixing it.  One easy way to write a testcase is to rely on the 'overflow' optimizations in instcombine. See the function overflow_mod_mul in Transforms/InstCombine/intrinsics.ll.

-Nadav


http://reviews.llvm.org/D8600

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