bootstrap failure on Darwin

[Geoffrey Keating <geoffk at apple dot com>]

Between revisions 115684 and 115706, gcc stopped bootstrapping on  
Darwin.

At present (revision 115718) it's failing with:

Comparing stages 2 and 3
warning: ./cc1-checksum.o differs
warning: ./cc1obj-checksum.o differs
warning: ./cc1plus-checksum.o differs
Bootstrap comparison failure!
./alloc-pool.o differs
./attribs.o differs
./build/genattr.o differs
./build/gencodes.o differs
./build/genconditions.o differs
./build/genconfig.o differs
... and many more files

The following changes look most likely to be causing the problem, my  
guess is the first one:

------------------------------------------------------------------------
r115704 | drow | 2006-07-23 19:59:36 -0700 (Sun, 23 Jul 2006) | 4 lines
        PR debug/27473
        * dbxout.c (output_used_types_helper, output_used_types): New.
        (dbxout_symbol): Call output_used_types.

------------------------------------------------------------------------
r115693 | hubicka | 2006-07-23 17:16:16 -0700 (Sun, 23 Jul 2006) | 13  
lines

	PR c/25795
	PR c++/27369
	* cgraph.c (cgraph_varpool_nodes): Export.
	(decide_is_variable_needed): Ignored "used" attribute in
	unit-at-a-time mode.
	* cgraph.h (cgraph_varpool_nodes): Declare.
	* cgraphunit.c (decide_is_function_needed): Ignored "used" attribute in
	unit-at-a-time mode.

	* gcc.dg/pr25795.c: New test.
	* gcc.dg/pr25795-1.c: New test.

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