[lto][patch] Really fix builtins this time

[Rafael Espindola]

The problem that some builtins (nextafter for example) should be
present is the symbol table. Others (like __builtin_frame_address)
should not. This patch fixes the problem by using the same function
that assemble_external_real uses to select what should be in the
symbol table.

2008-12-31  Rafael Avila de Espindola  <espindola@google.com>

	* lto-section-out.c (write_symbol_vec): Use incorporeal_function_p.
	* tree.h (incorporeal_function_p): New.
	* varasm.c (incorporeal_function_p): Not static anymore.
Cheers,
-- 
Rafael Avila de Espindola

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