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Roman Lebedev 86394fcb63 [ConstantRange] Add ushl_sat()/sshl_sat() methods.
Summary:
To be used in `ConstantRange::shlWithNoOverflow()`,
may in future be useful for when saturating shift/mul ops are added.

Unlike `ConstantRange::shl()`, these are precise.

Reviewers: nikic, spatel, reames

Reviewed By: nikic

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69960
2019-11-08 10:31:04 +03:00
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