Added %NeverOptimize runtime call that can disable optimizations for a method for tests.

test/mjsunit/osr-elements-kind.js

 // Copyright 2012 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 95 matching lines @@
     expected = elements_kind.fast;
   }
   assertEquals(expected, getKind(obj), name_opt);
 }
 
 // long-running loop forces OSR.
 for (var i = 0; i < 1000000; i++) { }
 
 if (support_smi_only_arrays) {
   function construct_smis() {
-    try {} catch (e) {} // TODO(titzer): DisableOptimization
+    %NeverOptimize();
     var a = [0, 0, 0];
     a[0] = 0;  // Send the COW array map to the steak house.
     assertKind(elements_kind.fast_smi_only, a);
     return a;
   }
   function construct_doubles() {
-    try {} catch (e) {} // TODO(titzer): DisableOptimization
+    %NeverOptimize();
     var a = construct_smis();
     a[0] = 1.5;
     assertKind(elements_kind.fast_double, a);
     return a;
   }
 
   // Test transition chain SMI->DOUBLE->FAST (crankshafted function will
   // transition to FAST directly).
   function convert_mixed(array, value, kind) {
-    try {} catch (e) {} // TODO(titzer): DisableOptimization
+    %NeverOptimize();
     array[1] = value;
     assertKind(kind, array);
     assertEquals(value, array[1]);
   }
   smis = construct_smis();
   convert_mixed(smis, 1.5, elements_kind.fast_double);
 
   doubles = construct_doubles();
   convert_mixed(doubles, "three", elements_kind.fast);
 
   convert_mixed(construct_smis(), "three", elements_kind.fast);
   convert_mixed(construct_doubles(), "three", elements_kind.fast);
 
   smis = construct_smis();
   doubles = construct_doubles();
   convert_mixed(smis, 1, elements_kind.fast);
   convert_mixed(doubles, 1, elements_kind.fast);
   assertTrue(%HaveSameMap(smis, doubles));
 }
 
 // Throw away type information in the ICs for next stress run.
 gc();