Fix a bug when shifting left by zero. Ensure that the left operand is...

test/mjsunit/smi-ops.js

 // Copyright 2008 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
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@@ skipping 567 matching lines @@
   assertEquals(5, 20.5 >> 2.7);
   var shift = 2.4;
   assertEquals(5, 20.5 >> shift);
   assertEquals(5, 20.5 >> shift + 0.3);
   shift = shift + zero;
   assertEquals(5, 20.5 >> shift);
   assertEquals(5, 20.5 >> shift + 0.3);
 }
 
 testShiftNonSmis();
+
+
+// Verify that we handle the (optimized) corner case of shifting by
+// zero even for non-smis.
+function shiftByZero(n) { return n << 0; }
+
+assertEquals(3, shiftByZero(3.1415));