warn-access: ignore template parameters when matching operator new/delete [PR109224]

warn-access: ignore template parameters when matching operator new/delete [PR109224]

Template parameters on a member operator new cannot affect its member
status nor whether it is a singleton or array operator new, hence, we
can ignore it for purposes of matching.  Similar logic applies to the
placement operator delete.

In the PR (and a lot of idiomatic coroutine code generally), operator
new is templated in order to be able to inspect (some of) the arguments
passed to the coroutine, to make allocation-related decisions.  However,
the coroutine implementation will not call a placement delete form, so
it cannot get templated.  As a result, when demangling, we have an extra
template DEMANGLE_COMPONENT_TEMPLATE around the actual operator new, but
not operator delete.  This terminates new_delete_mismatch_p early.

	PR middle-end/109224 - Wmismatched-new-delete false positive with a templated operator new (common with coroutines)

gcc/ChangeLog:

	PR middle-end/109224
	* gimple-ssa-warn-access.cc (new_delete_mismatch_p): Strip
	DEMANGLE_COMPONENT_TEMPLATE from the operator new and operator
	after demangling.

gcc/testsuite/ChangeLog:

	PR middle-end/109224
	* g++.dg/warn/Wmismatched-new-delete-9.C: New test.