[deoptimizer] Materialize array iterators in the deoptimizer.

This also introduces exhaustive switch-cases for instance types.

BUG=chromium:681383

Review-Url: https://codereview.chromium.org/2646433002
Cr-Commit-Position: refs/heads/master@{#42447}

src/deoptimizer.h

@@ -292,6 +292,9 @@ class TranslatedState {
   void UpdateFromPreviouslyMaterializedObjects();
   Handle<Object> MaterializeAt(int frame_index, int* value_index);
   Handle<Object> MaterializeObjectAt(int object_index);
+  class CapturedObjectMaterializer;
+  Handle<Object> MaterializeCapturedObjectAt(TranslatedValue* slot,
+                                             int frame_index, int* value_index);
   bool GetAdaptedArguments(Handle<JSObject>* result, int frame_index);
 
   static uint32_t GetUInt32Slot(Address fp, int slot_index);

test/mjsunit/regress/regress-681383.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+function f(deopt) {
+  let array = [42];
+  let it = array[Symbol.iterator]();
+  if (deopt) {
+    %_DeoptimizeNow();
+    return it.next().value;
+  }
+}
+
+f(false);
+f(false);
+%OptimizeFunctionOnNextCall(f);
+assertEquals(f(true), 42);