PR fortran/95687 - ICE in get_unique_hashed_string, at fortran/class.c:508

PR fortran/95687 - ICE in get_unique_hashed_string, at fortran/class.c:508

With submodules and PDTs, name mangling of interfaces may result in long
internal symbols overflowing a previously static internal buffer.  We now
set the buffer size dynamically.

gcc/fortran/
	PR fortran/95687
	* class.c (get_unique_type_string): Return a string with dynamic
	length.
	(get_unique_hashed_string, gfc_hash_value): Use dynamic result
	from get_unique_type_string instead of static buffer.