(ipa_polymorphic_call_context::speculation_consistent_p): Constify.
	(ipa_polymorphic_call_context::meet_speculation_with): New function.
	(ipa_polymorphic_call_context::combine_with): Handle types in construction
	better.
	(ipa_polymorphic_call_context::equal_to): Do not bother about useless
	speculation.
	(ipa_polymorphic_call_context::meet_with): New function.
	* cgraph.h (class ipa_polymorphic_call_context): Add
	meet_width, meet_speculation_with; constify speculation_consistent_p.
	* ipa-cp.c (ipa_context_from_jfunc): Handle speculation; combine with incomming
	context.
	(propagate_context_accross_jump_function): Likewise; be more cureful.
	about set_contains_variable.
	(ipa_get_indirect_edge_target_1): Fix handling of dynamic type changes.
	(find_more_scalar_values_for_callers_subset): Fix.
	(find_more_contexts_for_caller_subset): Perform meet operation.

From-SVN: r217634