re PR ipa/65908 (ICE: in expand_thunk, at cgraphunit.c:1700)

re PR ipa/65908 (ICE: in expand_thunk, at cgraphunit.c:1700)

	PR ipa/65908
	* ipa-icf.c (sem_item::target_supports_symbol_aliases): Remove
	construction of arg_types.
	(sem_function::sem_function): Likewise.
	(sem_function::~sem_function): Remove destruction of arg_types.
	(sem_function::compatible_parm_types_p): New function.
	(sem_function::equals_wpa): Reorg matching of return values
	and parameter types.
	(sem_function::equals_private): Reorg mathcing of argument types.
	(sem_function::parse_tree_args): Remove.
	* ipa-icf.h (init_wpa): Do not call it.
	(parse_tree_args): Remove.
	(compatible_parm_types_p): Declare.
	(result_type): Remove.
	(arg_types): Remove.
	* testsuite/g++.dg/ipa/pr65908.C: New testcase.

Co-Authored-By: Martin Liska <mliska@suse.cz>
From-SVN: r224720