[DAG] visitAND - fold (and (any_ext V), c) -> (zero_ext (and (trunc V), c)) if profitable.

Try to more aggressively narrow masks of extended values.

This is mainly for cases where the mask is trying to zero out any_extended upper bits, assuming we can zext/trunc the values for free.

This catches a few actual missed folds, as well as helps canonicalize a number of other cases which were being caught in isel etc.

Differential Revision: https://reviews.llvm.org/D145866