Fix build and test failures from packed array optimizations.

test/mjsunit/unbox-double-arrays.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 260 matching lines @@
                       expected_array_value(7));
 
   delete large_array[5];
   delete large_array[6];
   test_various_loads6(large_array,
                       undefined,
                       undefined,
                       expected_array_value(7));
 
   %DeoptimizeFunction(test_various_loads6);
-  gc();
+  %ClearFunctionTypeFeedback(test_various_stores);
+  %ClearFunctionTypeFeedback(test_various_loads7);
 
   // Test stores for non-NaN.
   var large_array = new allocator(large_array_size);
   force_to_fast_double_array(large_array);
   %OptimizeFunctionOnNextCall(test_various_stores);
   test_various_stores(large_array,
                       expected_array_value(5),
                       expected_array_value(6),
                       expected_array_value(7));
 
@@ skipping 245 matching lines @@
   assertEquals(expected_array_value(2), large_array4[2]);
 }
 
 test_setter();
 test_setter();
 test_setter();
 %OptimizeFunctionOnNextCall(test_setter);
 test_setter();
 test_setter();
 test_setter();