ipa.c (symtab_remove_unreachable_nodes): Remove symbol from comdat group if its body was eliminated.

	* ipa.c (symtab_remove_unreachable_nodes): Remove
	symbol from comdat group if its body was eliminated.
	(comdat_can_be_unshared_p_1): Static symbols can always
	be privatized.
	* symtab.c (symtab_remove_from_same_comdat_group): Break out
	from ...
	(symtab_unregister_node): ... this one.
	(verify_symtab_base): More strict checking of comdats.
	* cgraph.h (symtab_remove_from_same_comdat_group): Declare.

From-SVN: r210598