* lto-cgraph.c (get_alias_symbol): Remove weakref sanity check.
	(input_node, input_varpool_node): Handle correctly external same
	body aliases.
	* ipa.c (symtab_remove_unreachable_nodes): Do not remove external
	nodes at ltrans stage.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199675 138bc75d-0d04-0410-961f-82ee72b054a4