Remove the reference-related variable displays that now pass from the 'notnow' set.

The failures that remain are:

        # rdar://problem/8620735 test/types: frame variable -t a_class_ref.m_b fails
        # The reference type related failures that remain are:
        notnow = set(['a_class_ref.m_b',
                      'a_struct_ref.b',
                      'a_union_nonzero_ref.u.a'])

llvm-svn: 118021