Fix issue with getOwnPropertySymbols and hidden properties

test/mjsunit/regress/regress-crbug-350864.js

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-// Flags: --allow-natives-syntax
+// Flags: --harmony_symbols --harmony-collections
 
-var a = { x: 1.1 };
-a.x = 0;
-var G = a.x;
-var o = { x: {} };
-
-function func() {
-  return {x: G};
-}
-
-func();
-func();
-%OptimizeFunctionOnNextCall(func);
-assertEquals(0, func().x);
+var v0 = new WeakMap;
+var v1 = {};
+v0.set(v1, 1);
+var sym = Symbol();
+v1[sym] = 1;
+var symbols = Object.getOwnPropertySymbols(v1);
+assertArrayEquals([sym], symbols);