Merge: Fixes for GLYPH_DEBUG found by GCC 4.6.0 static checking.

diff --cc src/ChangeLog
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--- 2/src/ChangeLog
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@@@ -1,3 -1,31 +1,31 @@@
 -      GLYPH_DEBUG fixes
+ 2011-06-22  Paul Eggert  <eggert@cs.ucla.edu>
+ 
++      Fixes for GLYPH_DEBUG found by GCC 4.6.0 static checking.
+       The following patches are for when GLYPH_DEBUG && !XASSERT.
+       * dispextern.h (trace_redisplay_p, dump_glyph_string):
+       * dispnew.c (flush_stdout):
+       * xdisp.c (dump_glyph_row, dump_glyph_matrix, dump_glyph):
+       Mark as externally visible.
+       * dispnew.c (check_window_matrix_pointers): Now static.
+       * dispnew.c (window_to_frame_vpos):
+       * xfns.c (unwind_create_frame):
+       * xterm.c (x_check_font): Remove unused local.
+       * scroll.c (CHECK_BOUNDS):
+       * xfaces.c (cache_fache): Rename local to avoid shadowing.
+       * xfns.c, w32fns.c (image_cache_refcount, dpyinfo_refcount): Now static.
+       * xdisp.c (check_window_end): Now a no-op if !XASSERTS.
+       (debug_first_unchanged_at_end_vpos, debug_last_unchanged_at_beg_vpos)
+       (debug_dvpos, debug_dy, debug_delta, debug_delta_bytes, debug_end_vpos):
+       Now static.
+       (debug_method_add): Use va_list and vsprintf rather than relying
+       on undefined behavior with wrong number of arguments.
+       (dump_glyph, dump_glyph_row, Fdump_glyph_matrix):
+       Don't assume ptrdiff_t and EMACS_INT are the same width as int.
+       In this code, it's OK to assume C99 behavior for ptrdiff_t formats
+       since we're not interested in debugging glyphs with old libraries.
+       * xfaces.c (cache_face): Move debugging code earlier; this pacifies
+       GCC 4.6.0's static checking.
+ 
  2011-06-22  Paul Eggert  <eggert@cs.ucla.edu>
  
        Integer overflow and signedness fixes (Bug#8873).