[Turbofan] Implement super calls with spread bytecode in assembly code.

src/runtime/runtime-array.cc

Index: src/runtime/runtime-array.cc
diff --git a/src/runtime/runtime-array.cc b/src/runtime/runtime-array.cc
index a9cbc208b34e442cc25d4f40dedf46acfba62ded..20cd65974c0fcaa67e38c823b246b36e073bf970 100644
--- a/src/runtime/runtime-array.cc
+++ b/src/runtime/runtime-array.cc
@@ -646,5 +646,33 @@ RUNTIME_FUNCTION(Runtime_SpreadIterablePrepare) {
   return *spread;
 }
 
+RUNTIME_FUNCTION(Runtime_SpreadIterableFixed) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, spread, 0);
+
+  // The caller should check if proper iteration is necessary.
+  Handle<JSFunction> spread_iterable_function = isolate->spread_iterable();
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, spread,
+      Execution::Call(isolate, spread_iterable_function,
+                      isolate->factory()->undefined_value(), 1, &spread));
+
+  // Create a new FixedArray and put the result of the spread into it.
+  Handle<JSArray> spread_array = Handle<JSArray>::cast(spread);
+  uint32_t spread_length;
+  CHECK(spread_array->length()->ToArrayIndex(&spread_length));
+
+  Handle<FixedArray> result = isolate->factory()->NewFixedArray(spread_length);
+  ElementsAccessor* accessor = spread_array->GetElementsAccessor();
+  for (uint32_t i = 0; i < spread_length; i++) {
+    DCHECK(accessor->HasElement(spread_array, i));
+    Handle<Object> element = accessor->Get(spread_array, i);
+    result->set(i, *element);
+  }
+
+  return *result;
+}
+
 }  // namespace internal
 }  // namespace v8