Merge fixes for reliability bot crashes to trunk.

test/mjsunit/external-array.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 175 matching lines @@
 
   // Test the correct behavior of the |length| property (which is read-only).
   if (t != 0) {
     assertEquals(kElementCount, a.length);
     a.length = 2;
     assertEquals(kElementCount, a.length);
     assertTrue(delete a.length);
     a.length = 2;
     assertEquals(2, a.length);
   }
+
+  function array_load_set_smi_check(a) {
+    return a[0] = a[0] = 1;
+  }
+
+  array_load_set_smi_check(a);
+  array_load_set_smi_check(0);
+
+  function array_load_set_smi_check2(a) {
+    return a[0] = a[0] = 1;
+  }
+
+  array_load_set_smi_check2(a);
+  %OptimizeFunctionOnNextCall(array_load_set_smi_check2);
+  array_load_set_smi_check2(a);
+  array_load_set_smi_check2(0);
+  %DeoptimizeFunction(array_load_set_smi_check2);
+  gc();  // Makes V8 forget about type information for array_load_set_smi_check.
 }