[X86] combineAndnp - constant fold ANDNP(C,X) -> AND(~C,X) (REAPPLIED)

If the LHS op has a single use then using the more general AND op is likely to allow commutation, load folding, generic folds etc.

Updated version - original version rG057db2002bb3 didn't correctly account for multiple uses of the mask that might be folding "OR(AND(X,C),AND(Y,~C)) -> OR(AND(X,C),ANDNP(C,Y))" in canonicalizeBitSelect