re PR lto/54709 (r191713 breaks Firefox build)

re PR lto/54709 (r191713 breaks Firefox build)

2012-09-27  Richard Guenther  <rguenther@suse.de>

	PR lto/54709
	* lto-symtab.c (resolution_guessed_p): Remove.
	(set_resolution_guessed): Likewise.
	(lto_symtab_register_decl): Remove assert.
	(lto_symtab_resolve_symbols): Do not alter symbol resolutions
	and return the prevailing symbol, checking for multiple prevailing
	symbols here.
	(lto_symtab_merge_decls_1): Use the result from
	lto_symtab_resolve_symbols.  Do not alter symbol resolutions.

	* gcc.dg/lto/pr54709_0.c: New testcase.
	* gcc.dg/lto/pr54709_1.c: Likewise.

From-SVN: r191798