Craig Topper d23004c37b Introduce APInt::isSignBitSet/isSignBitClear. Use in place isSignBitSet in place of isNegative in known bits tracking. ...

This makes statements like KnownZero.isNegative() (which means the value we're tracking is positive) less confusing.

llvm-svn: 300457

2017-04-17 16:38:20 +00:00

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