[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 cb849d2067ad0bb02a539817e6ef9ea5221a0942..c95ef969bfabe2a7e6c450a247eb11299bd5a771 100644
--- a/src/runtime/runtime-array.cc
+++ b/src/runtime/runtime-array.cc
@@ -648,5 +648,28 @@ RUNTIME_FUNCTION(Runtime_SpreadIterablePrepare) {
   return *spread;
 }
 
+RUNTIME_FUNCTION(Runtime_SpreadIterablePrepareFixed) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, spread, 0);
+
+  // 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));
+  }
+  // Return the backing store fixed array.
+  Handle<JSArray> spread_array = Handle<JSArray>::cast(spread);
+  uint32_t spread_length;
+  CHECK(spread_array->length()->ToArrayIndex(&spread_length));
+
+  FixedArrayBase* a = spread_array->elements();
+  a->set_length(spread_length);
+  return a;
+}
+
 }  // namespace internal
 }  // namespace v8