[SYCL] Changes to visitor model in preparation of array support. (#1764)

Signed-off-by: rdeodhar <[email protected]>

Author: rdeodhar

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -10822,6 +10822,8 @@ def err_sycl_non_trivially_copy_ctor_dtor_type
             "constructible|destructible}0 class/struct type %1">;
 def err_sycl_non_std_layout_type : Error<
   "kernel parameter has non-standard layout class/struct type %0">;
+def err_sycl_non_constant_array_type : Error<
+  "kernel parameter is not a constant size array %0">;
 def err_conflicting_sycl_kernel_attributes : Error<
   "conflicting attributes applied to a SYCL kernel">;
 def err_conflicting_sycl_function_attributes : Error<