Use bitmaps for cons cells, as was done for floats.

(init_float, init_cons): Let the normal code allocate the first block.
(CONS_BLOCK_SIZE): Redefine based on BLOCK_BYTES and bitmap size.
(CONS_BLOCK, CONS_INDEX, CONS_MARKED_P, CONS_MARK, CONS_UNMARK): New macros.
(struct cons_block): Move conses to the beginning.  Add gcmarkbits.
(Fcons): Use lisp_align_malloc and CONS_UNMARK.
(live_cons_p): Check the pointer is not past the `conses' array.
(mark_maybe_object, mark_maybe_pointer): Use CONS_MARKED_P.
(mark_object, mark_buffer): Use CONS_MARKED_P and CONS_MARK.
(survives_gc_p): Use CONS_MARKED_P and simplify.
(gc_sweep): Use CONS_MARKED_P, CONS_UNMARK, and lisp_align_free.

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