[SYCL] Update native_specialization_constant when no specialization constants are present (#8868)

From the spec update KhronosGroup/SYCL-Docs#346,
`native_specialization_constant()` should return false when the kernel
bundle contains no specialization constants.

---------

Signed-off-by: Cai, Justin <[email protected]>

Author: jzc

sycl/source/detail/kernel_bundle_impl.hpp

@@ -402,7 +402,8 @@ class kernel_bundle_impl {
   }
 
   bool native_specialization_constant() const noexcept {
-    return std::all_of(MDeviceImages.begin(), MDeviceImages.end(),
+    return contains_specialization_constants() &&
+           std::all_of(MDeviceImages.begin(), MDeviceImages.end(),
                        [](const device_image_plain &DeviceImage) {
                          return getSyclObjImpl(DeviceImage)
                              ->all_specialization_constant_native();

sycl/test-e2e/SpecConstants/2020/kernel-bundle-api.cpp

@@ -31,6 +31,7 @@ class TestSetAndGetOnDevice;
 bool test_default_values(sycl::queue q);
 bool test_set_and_get_on_host(sycl::queue q);
 bool test_set_and_get_on_device(sycl::queue q);
+bool test_native_specialization_constant(sycl::queue q);
 
 int main() {
   auto exception_handler = [&](sycl::exception_list exceptions) {
@@ -63,6 +64,12 @@ int main() {
     return 1;
   }
 
+  if (!test_native_specialization_constant(q)) {
+    std::cout << "Test for native specialization constants failed!"
+              << std::endl;
+    return 1;
+  }
+
   return 0;
 };
 
@@ -257,3 +264,11 @@ bool test_set_and_get_on_device(sycl::queue q) {
 
   return true;
 }
+
+bool test_native_specialization_constant(sycl::queue q) {
+  const auto always_false_selector = [](auto device_image) { return false; };
+  auto bundle = sycl::get_kernel_bundle<sycl::bundle_state::executable>(
+      q.get_context(), always_false_selector);
+  return check_value(bundle.native_specialization_constant(), false,
+                     "empty bundle native specialization constant");
+}