(toplevel): Include process.h.

(toplevel): Include process.h.
(enum mem_type): Add MEM_TYPE_PROCESS, MEM_TYPE_HASH_TABLE,
MEM_TYPE_FRAME, MEM_TYPE_WINDOW enumerators.
(allocate_vectorlike): Make it a static function.  Add parameter TYPE.
(allocate_vector, allocate_hash_table, allocate_window)
(allocate_frame, allocate_process, allocate_other_vector): New
functions.
(Fmake_vector): Call allocate_vector instead of allocate_vectorlike.
(mark_maybe_pointer): New function.
(mark_memory): Also mark Lisp data to which only pointers
remain and not Lisp_Objects.
(min_heap_address, max_heap_address): New variables.
(mem_find): Return MEM_NIL if START is below min_heap_address or
above max_heap_address.
(mem_insert): Compute min_heap_address and max_heap_address.