c++, coroutines: check for members we use in handle_types [PR105475]

c++, coroutines: check for members we use in handle_types [PR105475]

Currently, it is possible to ICE GCC by giving it sufficiently broken
code, where sufficiently broken means a std::coroutine_handle missing a
default on the promise_type template argument, and missing members.
As the code generator relies on lookups in the coroutine_handle never
failing (and has no way to signal that error), lets do it ahead of time,
save the result, and use that.  This saves us some lookups and allows us
to propagate an error.

PR c++/105475 - coroutines: ICE in coerce_template_parms, at cp/pt.cc:9183

This includes refactoring from 370a0dee55569, ffd521d8dcddcd4 and
00019b88e714c29c387.

gcc/cp/ChangeLog:

	PR c++/105475
	* coroutines.cc (struct coroutine_info): Add from_address.
	Carries the from_address member we looked up earlier.
	(coro_resume_identifier): Remove.  Unused.
	(coro_init_identifiers): Do not initialize the above.
	(struct susp_frame_data): Remove unused members, provide a CTOR.
	(void_coro_handle_address): New variable.  Contains the baselink
	for the std::coroutine_handle<void>::address() instance method.
	(get_handle_type_address): New function.  Looks up and validates
	handle_type::address in a given handle_type.
	(get_handle_type_from_address): New function.  Looks up and
	validates handle_type::from_address in a given handle_type.
	(coro_promise_type_found_p): Remove reliance on
	coroutine_handle<> defaulting the promise type to void.  Store
	get_handle_type_* results where appropriate.
	(struct local_vars_frame_data): Add a CTOR.
	(replace_continue): Look up expression type.
	(get_coroutine_from_address): New helper.  Gets the
	handle_type::from_address BASELINK from a coroutine_info.
	(morph_fn_to_coro): Use susp_frame_data CTOR, and make the suspend
	state hash map local to the morph function. Use CTOR for
	local_vars_frame_data instead of brace init.
	(build_actor_fn): Use the get_coroutine_from_address helper and
	void_coro_handle_address.

gcc/testsuite/ChangeLog:

	PR c++/105475
	* g++.dg/coroutines/pr103868.C: Add std::coroutine_handle
	members we check for now.
	* g++.dg/coroutines/pr105287.C: Ditto.
	* g++.dg/coroutines/pr105301.C: Ditto.
	* g++.dg/coroutines/pr94528.C: Ditto.
	* g++.dg/coroutines/pr94879-folly-1.C: Ditto.
	* g++.dg/coroutines/pr94883-folly-2.C: Ditto.
	* g++.dg/coroutines/pr98118.C: Ditto.
	* g++.dg/coroutines/pr105475.C: New test.
	* g++.dg/coroutines/pr105475-1.C: New test.
	* g++.dg/coroutines/pr105475-2.C: New test.
	* g++.dg/coroutines/pr105475-3.C: New test.
	* g++.dg/coroutines/pr105475-4.C: New test.
	* g++.dg/coroutines/pr105475-5.C: New test.
	* g++.dg/coroutines/pr105475-6.C: New test.
	* g++.dg/coroutines/pr105475-broken-spec.C: New test.
	* g++.dg/coroutines/pr105475-broken-spec-2.C: New test.

Co-authored-by: Arsen Arsenović <arsen@aarsen.me>
(cherry picked from commit 5b4476a165565cb20729c0a97a3f43b060595209)