Update ObjectToString to Harmony-draft algorithm

test/mjsunit/es6/symbols.js

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-// Flags: --expose-gc --allow-natives-syntax
+// Flags: --expose-gc --allow-natives-syntax --harmony-tostring
 
 var symbols = []
 
 
 // Returns true if the string is a valid
 // serialization of Symbols added to the 'symbols'
 // array. Adjust if you extend 'symbols' with other
 // values.
 function isValidSymbolString(s) {
   return ["Symbol(66)", "Symbol()"].indexOf(s) >= 0;
@@ skipping 463 matching lines @@
 }
 TestRegistry()
 
 
 function TestGetOwnPropertySymbolsOnPrimitives() {
   assertEquals(Object.getOwnPropertySymbols(true), []);
   assertEquals(Object.getOwnPropertySymbols(5000), []);
   assertEquals(Object.getOwnPropertySymbols("OK"), []);
 }
 TestGetOwnPropertySymbolsOnPrimitives();