bitmap.c (bitmap_release_memory): Move adjacent to the allocation functions.

bitmap.c (bitmap_release_memory): Move adjacent to the allocation functions.

        * bitmap.c (bitmap_release_memory): Move adjacent to the
        allocation functions.
        (bitmap_first_set_bit, bitmap_last_set_bit): Streamline knowing
        the implementation.  Binary search for the set bit.
        (bitmap_union_of_diff): Allocate the temporary on the stack
        instead of using xmalloc.

From-SVN: r43822