All private symbols are own symbols

test/mjsunit/harmony/private.js

Index: test/mjsunit/harmony/private.js
diff --git a/test/mjsunit/harmony/private.js b/test/mjsunit/harmony/private.js
index c08daf105055cfcc9ac8ea940c4372bf0b8e0803..0adbb13b21a38f70730cc691416f0b8e31b10f36 100644
--- a/test/mjsunit/harmony/private.js
+++ b/test/mjsunit/harmony/private.js
@@ -241,7 +241,8 @@ function TestKeyGet(obj) {
   var obj2 = Object.create(obj)
   for (var i in symbols) {
     assertEquals(i|0, obj[symbols[i]])
-    assertEquals(i|0, obj2[symbols[i]])
+    // Private symbols key own-properties.
+    assertEquals(undefined, obj2[symbols[i]])
   }
 }
 
@@ -352,3 +353,52 @@ function TestSealAndFreeze(freeze) {
 TestSealAndFreeze(Object.seal)
 TestSealAndFreeze(Object.freeze)
 TestSealAndFreeze(Object.preventExtensions)
+
+
+var s = %CreatePrivateSymbol("s");
+var s1 = %CreatePrivateSymbol("s1");
+
+function TestSimple() {
+  var p = {}
+  p[s] = "moo";
+
+  var o = Object.create(p);
+
+  assertEquals(undefined, o[s]);
+  assertEquals("moo", p[s]);
+
+  o[s] = "bow-wow";
+  assertEquals("bow-wow", o[s]);
+  assertEquals("moo", p[s]);
+}
+TestSimple();
+
+
+function TestICs() {
+  var p = {}
+  p[s] = "moo";
+
+
+  var o = Object.create(p);
+  o[s1] = "bow-wow";
+  function checkNonOwn(o) {
+    assertEquals(undefined, o[s]);
+    assertEquals("bow-wow", o[s1]);
+  }
+
+  checkNonOwn(o);
+
+  // Test monomorphic/optimized.
+  for (var i = 0; i < 1000; i++) {
+    checkNonOwn(o);
+  }
+
+  // Test non-monomorphic.
+  for (var i = 0; i < 1000; i++) {
+    var oNew = Object.create(p);
+    oNew["s" + i] = i;
+    oNew[s1] = "bow-wow";
+    checkNonOwn(oNew);
+  }
+}
+TestICs();