Fix thunk info WRT PCH

Fix thunk info WRT PCH

	PR pch/97593
	* cgraph.c (cgraph_node::create_thunk): Register thunk as early during
	parsing.
	* cgraphunit.c (analyze_functions): Call
	thunk_info::process_early_thunks.
	* symtab-thunks.cc (struct unprocessed_thunk): New struct.
	(thunks): New static variable.
	(thunk_info::register_early): New member function.
	(thunk_info::process_early_thunks): New member function.
	* symtab-thunks.h (thunk_info::register_early): Declare.
	(thunk_info::process_early_thunks): Declare.