From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 6 Jul 2011 21:56:44 +0000 (-0700)
Subject: Merge: Remove unportable assumption about struct layout (Bug#8884).
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Merge: Remove unportable assumption about struct layout (Bug#8884).

* buffer.c (clone_per_buffer_values): Don't assume that
sizeof (struct buffer) is a multiple of sizeof (Lisp_Object).
This isn't true in general, and it's particularly not true
if Emacs is configured with --with-wide-int.
* buffer.h (FIRST_FIELD_PER_BUFFER, LAST_FIELD_PER_BUFFER):
New macros, used in the buffer.c change.
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437dd18bf116330a43585f85aac12e6a8171b8a2