Fix choose_bitmap_and() so that partial index predicates are considered when

Fix choose_bitmap_and() so that partial index predicates are considered when
deciding whether a potential additional indexscan is redundant or not.  As now
coded, any use of a partial index that was already used in a previous AND arm
will be rejected as redundant.  This might be overly restrictive, but not
considering the point at all is definitely bad, as per example in bug #2441
from Arjen van der Meijden.  In particular, a clauseless scan of a partial
index was *never* considered redundant by the previous coding, and that's
surely wrong.  Being more flexible would also require some consideration
of how not to double-count the index predicate's selectivity.