Correctly fill up cgraph_node::local.versionable flag.

Correctly fill up cgraph_node::local.versionable flag.

	* cgraphclones.c (cgraph_node::create_virtual_clone):
	Verify cgraph_node.local.versionable instead of calling
	tree_versionable_function_p.
	* ipa-cp.c (determine_versionability): Save the information
	to ipa_node_params summary.
	(ipcp_versionable_function_p): Use it.
	(ipcp_propagate_stage): Pass IPA_NODE_REF to a called function.
	(ipcp_generate_summary): Do not compute cgraph_node
	versionability.
	* ipa-inline-analysis.c (inline_generate_summary): Compute
	versionability for all cgraph nodes.
	* ipa-prop.c (ipa_node_params_t::duplicate): Duplicate
	ipa_node_params::versionability.
	* ipa-prop.h (struct ipa_node_params): Declare it.

From-SVN: r229055