Max Kazantsev d792171efb [ConstantRange] Support for ashr in ConstantRange computation ...

Extend the ConstantRange implementation to compute the range of possible values resulting from an arithmetic right shift operation.
There will be a follow up patch to leverage this constant range infrastructure in LazyValueInfo.

Patch by Surya Kumari Jangala!

Differential Revision: https://reviews.llvm.org/D40881

llvm-svn: 320976

2017-12-18 13:01:32 +00:00

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