[turbofan] Fix various bailout points for AstGraphBuilder.

test/mjsunit/compiler/deopt-accessors4.js

+// Copyright 2016 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
+
+var o = {v:1};
+var deopt = false;
+
+Object.defineProperty(o, "x", {
+  get: function() { return this.v; },
+  set: function(v) {
+    this.v = v;
+    if (deopt) {
+      %DeoptimizeFunction(foo);
+    }
+  }
+});
+
+function foo(o) {
+  var x = "x";
+  return ++o[x];
+}
+
+assertEquals(2, foo(o));
+assertEquals(3, foo(o));
+%OptimizeFunctionOnNextCall(foo);
+deopt = true;
+assertEquals(4, foo(o));