Craig Topper f0aeee01c3 [KnownBits] Add wrapper methods for setting and clear all bits in the underlying APInts in KnownBits. ...

This adds routines for reseting KnownBits to unknown, making the value all zeros or all ones. It also adds methods for querying if the value is zero, all ones or unknown.

Differential Revision: https://reviews.llvm.org/D32637

llvm-svn: 302262

2017-05-05 17:36:09 +00:00

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