[SYCL] Add test for default initialized local memory

SYCL/GroupLocalMemory/group_local_memory.cpp

@@ -24,8 +24,13 @@ struct Foo {
   int Values[WgSize];
 };
 
+struct Bar {
+  int Value = 42;
+};
+
 class KernelA;
 class KernelB;
+class KernelC;
 
 using namespace sycl;
 
@@ -48,7 +53,7 @@ int main() {
             // Foo &Ref = *group_local_memory<Foo>(Item.get_group(), ...);
             multi_ptr<Foo, access::address_space::local_space,
                       sycl::access::decorated::legacy>
-                Ptr = group_local_memory<Foo>(
+                Ptr = sycl::ext::oneapi::group_local_memory<Foo>(
                     Item.get_group(), 1,
                     CounterAcc[Item.get_group_linear_id()]);
             Ptr->Values[Item.get_local_linear_id()] *=
@@ -82,8 +87,8 @@ int main() {
           nd_range<1>(range<1>(Size), range<1>(WgSize)), [=](nd_item<1> Item) {
             multi_ptr<int[WgSize], access::address_space::local_space,
                       sycl::access::decorated::legacy>
-                Ptr = group_local_memory_for_overwrite<int[WgSize]>(
-                    Item.get_group());
+                Ptr = sycl::ext::oneapi::group_local_memory_for_overwrite<
+                    int[WgSize]>(Item.get_group());
             (*Ptr)[Item.get_local_linear_id()] = Item.get_local_linear_id();
 
             Item.barrier();
@@ -98,4 +103,27 @@ int main() {
     for (size_t I = 0; I < Size; ++I)
       assert(Acc[I] == I % WgSize);
   }
+
+  {
+    std::vector<int> Vec(Size, 0);
+    buffer<int, 1> Buf{Vec.data(), range<1>(Size)};
+
+    Q.submit([&](handler &Cgh) {
+      auto Acc = Buf.get_access<access::mode::write>(Cgh);
+      Cgh.parallel_for<KernelC>(
+          nd_range<1>(range<1>(Size), range<1>(WgSize)), [=](nd_item<1> Item) {
+            multi_ptr<Bar, access::address_space::local_space,
+                      sycl::access::decorated::legacy>
+                Ptr = sycl::ext::oneapi::group_local_memory_for_overwrite<Bar>(
+                    Item.get_group());
+            // Make sure that the value is default initialized on all items.
+            Acc[Item.get_global_linear_id()] = Ptr->Value;
+          });
+    });
+
+    auto Acc = Buf.get_access<access::mode::read>();
+    Bar RefBar;
+    for (size_t I = 0; I < Size; ++I)
+      assert(Acc[I] == RefBar.Value);
+  }
 }