c++: ICE with operator delete [PR104846]

c++: ICE with operator delete [PR104846]

This is an ICE-on-invalid with "auto operator delete[] (void *)" whose
return type must be void.  The return type is checked in coerce_delete_type
but we never got there in this test, because we took the wrong path in
grokdeclarator, set type to error_mark_node, ended up creating a FIELD_DECL
with build_decl, and confused grokmethod by giving it a FIELD_DECL.

Fixed by not taking the data member path for a FUNCTION_TYPE.

	PR c++/104846

gcc/cp/ChangeLog:

	* decl.cc (grokdeclarator): Check FUNC_OR_METHOD_TYPE_P before giving
	data member errors.

gcc/testsuite/ChangeLog:

	* g++.dg/init/delete5.C: New test.