Fix JSON parser Handle leak

test/mjsunit/regress/regress-3976.js

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-// Flags: --max-old-space-size=60
+// Flags: --max-old-space-size=60 --check-handle-count
 
 table = [];
 
 for (var i = 0; i < 32; i++) {
  table[i] = String.fromCharCode(i + 0x410);
 }
 
 
 var random = (function() {
   var seed = 10;
@@ skipping 32 matching lines @@
 
 
 print("generating");
 
 var str = generate(50000);
 
 print("parsing "  + str.length);
 JSON.parse(str);
 
 print("done");