glsl/tests: Add UINT64 and INT64 types

glsl/tests: Add UINT64 and INT64 types

glsl/tests/uniform_initializer_utils.cpp:83:14: warning: enumeration value ‘GLSL_TYPE_UINT64’ not handled in switch [-Wswitch]
       switch (type->base_type) {
              ^
glsl/tests/uniform_initializer_utils.cpp:83:14: warning: enumeration value ‘GLSL_TYPE_INT64’ not handled in switch [-Wswitch]

Fixes: 8ce53d4a2f3 ("glsl: Add basic ARB_gpu_shader_int64 types")
Signed-off-by: Rhys Kidd <rhyskidd@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Elie Tournier <tournier.elie@gmail.com>