PR middle-end/42228

	PR middle-end/42228
	PR middle-end/42110
	* cgraph.c (cgraph_create_edge_including_clones): Add old_stmt parameter;
	update edge if it already exists.
	(cgraph_remove_node): Handle correctly cases where we are removing node having
	clones.
	* cgraph.h (cgraph_create_edge_including_clones): Declare.
	(verify_cgraph_node): Add missing error_found = true code.
	(cgraph_materialize_all_clones): Remove call edges of dead nodes.
	* ipa.c (cgraph_remove_unreachable_nodes): Correctly look for master
	clone; fix double linked list removal.
	* tree-inline.c (copy_bb): Update cgraph_create_edge_including_clones call;
	fix frequency of newly created edge.

	* g++.dg/torture/pr42110.C: new file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@155140 138bc75d-0d04-0410-961f-82ee72b054a4