When optimizing demanded bits of the operands of an Add we have to
remove the nsw/nuw flags as we have no guarantee anymore that we don't
wrap. This is legal here because the top bit is not demanded. In fact
this operaion was already performed but missed in the case of an Add
with a constant on the right side. To fix this this patch refactors the
code to unify the code paths in SimplifyDemandedUseBits() handling of
Add/Sub:
- The transformation of Add->Or is removed from the simplify demand code because the equivalent transformation exists in InstCombiner::visitAdd()
- KnownOnes/KnownZero are not adjusted for Add x, C anymore as computeKnownBits() already performs these computations.
- The simplification of the operands is unified. In this new version constant on the right side of a Sub are shrunk now as I could not find a reason why not to do so.
- The special case for clearing nsw/nuw in ShrinkDemandedConstant() is not necessary anymore as the caller does that already.
This also fixes PR11449.
Any reason why you changed this? countLeadingZeros returns an unsigned.