c++/reflection: fix type_of for member fns [PR123934]

c++/reflection: fix type_of for member fns [PR123934]

Here the assert was wrongly failing with

  'void (struct F::)(int)' is not the same as 'void(int)'

but as per [dcl.fct]/1 the type of fType should not include the class F.

	PR c++/123934

gcc/cp/ChangeLog:

	* reflect.cc (type_of): For FUNCTION_DECLs, use static_fn_type.

gcc/testsuite/ChangeLog:

	* g++.dg/reflect/type_of2.C: Uncomment an assert.

Reviewed-by: Jason Merrill <jason@redhat.com>