[turbofan] Properly deal with out-of-bounds fields in EscapeAnalysis.

test/mjsunit/regress/regress-crbug-658185.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
+// Flags: --allow-natives-syntax --turbo-escape
 
-var o = {};
-function bar(o) {
-  return 1 + (o.t ? 1 : 2);
+var t = 0;
+function foo() {
+  var o = {x:1};
+  var p = {y:2.5, x:0};
+  o = [];
+  for (var i = 0; i < 2; ++i) {
+    t = o.x;
+    o = p;
+  }
 }
-function foo() {
-  bar(o);
-}
+foo();
 foo();
 %OptimizeFunctionOnNextCall(foo);
 foo();