PR lto/57038
	PR lto/47375
	* lto-symtab.c (lto_symtab_symbol_p): Add external symbol; weakrefs are
	not external.
	(lto_symtab_merge_decls): Fix thinko when dealing with non-lto_symtab decls.
	(lto_symtab_merge_cgraph_nodes): Use lto_symtab_symbol_p.
	(lto_symtab_prevailing_decl): Get int sync with lto_symtab_symbol_p.
	* varpool.c (dump_varpool_node): Dump more flags.

	* lto-partition.c (get_symbol_class): Fix weakrefs.
	(lto_balanced_map): Fix weakrefs.
	(privatize_symbol_name): Remove unnecesary label.
	(rename_statics): Handle weakrefs as statics.

	* gcc.dg/lto/attr-weakref-1_0.c: New testcase.
	* gcc.dg/lto/attr-weakref-1_1.c: New testcase.
	* gcc.dg/lto/attr-weakref-1_2.c: New testcase.

From-SVN: r198917