Introduce APInt::isSignBitSet/isSignBitClear. Use in place isSignBitSet in...
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
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