Discard killed buffers from deleted window and frame objects.
This reduces an amount of references to killed buffers and helps GC to reclaim them faster. * alloc.c (discard_killed_buffers): New function. (mark_object): Use it for deleted windows and frames. (mark_object): If symbol's value is set up for a killed buffer or deleted frame, restore it's global binding. * data.c (swap_in_global_binding): Add GC notice. (swap_in_symval_forwarding): Use convenient set_blv_where. * window.c (wset_next_buffers, wset_prev_buffers): Move ... * window.h: ... to here.
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