Failing OpenCL vector traits due to address spaces

[AnastasiaStulova]

many vector traits seem to have issues is used with address spaces deduced.

Here is an example:

int4 v;
static_assert(std::vector_size<decltype(v)>::value==4); // This fails because  v is '__provate int4' and not 'int4'

To make them work we need to add remove_address_space trait everywhere. Could we reduce such verbosity by providing extra specializations of such traits? We can probably do it universally for all qualifiers and add a description as a rule:

any top level qualifier provided with type T is ignored/stripped out before ...