Fix stupid bug: actually add absent non-overlapped mappings.
Make the allocsite-is-static assertion try harder.
trumptr: fix __like_a selection for base types.
Support 'size-only' allocation functions (size--action split). Some crunchcc objcopy tweaks also.
Use __current_allocating to suppress during-allocation errors, since __current_allocfn and __current_allocsite now have subtler meaning. Support signedness-complement like-a matching. Fix (hopefully) offset reporting in __is_a failure message.