Commit 4461f3c3 authored by Joel Galenson's avatar Joel Galenson Committed by Yi Kong
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[ConstantRange] Support subtraction in makeGuaranteedNoWrapRegion. 

Previously ConstantRange::makeGuaranteedNoWrapRegion only handled addition.  This adds support for subtraction.

Differential Revision: https://reviews.llvm.org/D40036

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319806 91177308-0d34-0410-b5e6-96231b3b80d8
parent 2f381704
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