[Ignition/turbo] Add a CallWithSpread bytecode.

src/runtime/runtime-classes.cc

Index: src/runtime/runtime-classes.cc
diff --git a/src/runtime/runtime-classes.cc b/src/runtime/runtime-classes.cc
index 9398586de5fed40711c5be4e2d8a090564ed0da9..a0fb019e83b0dc2cd98db81ffda47661363e9fc1 100644
--- a/src/runtime/runtime-classes.cc
+++ b/src/runtime/runtime-classes.cc
@@ -459,5 +459,48 @@ RUNTIME_FUNCTION(Runtime_GetSuperConstructor) {
   return prototype;
 }
 
+RUNTIME_FUNCTION(Runtime_CallWithSpread) {
+  HandleScope scope(isolate);
+  DCHECK_LE(3, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, callable, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
+
+  int function_argc = args.length() - 2;
+  CONVERT_ARG_HANDLE_CHECKED(Object, spread, args.length() - 1);
+
+  // Iterate over the spread if we need to.
+  if (spread->IterationHasObservableEffects()) {
+    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));
+  }
+
+  uint32_t spread_length;
+  Handle<JSArray> spread_array = Handle<JSArray>::cast(spread);
+  CHECK(spread_array->length()->ToArrayIndex(&spread_length));
+  int result_length = function_argc - 1 + spread_length;
+  ScopedVector<Handle<Object>> function_args(result_length);
+
+  // Append each of the individual args to the result.
+  for (int i = 0; i < function_argc - 1; i++) {
+    function_args[i] = args.at<Object>(2 + i);
+  }
+
+  // Append element of the spread to the result.
+  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);
+    function_args[function_argc - 1 + i] = element;
+  }
+
+  // Call the function.
+  RETURN_RESULT_OR_FAILURE(
+      isolate, Execution::Call(isolate, callable, receiver, result_length,
+                               function_args.start()));
+}
+
 }  // namespace internal
 }  // namespace v8