Revert of Revert of [es6] don't throw if argument is non-object (O.freeze, O.seal, O.preventExtensions)

test/mjsunit/object-seal.js

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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Tests the Object.seal and Object.isSealed methods - ES 15.2.3.9 and
-// ES 15.2.3.12
+// Tests the Object.seal and Object.isSealed methods - ES 19.1.2.17 and
+// ES 19.1.2.13
 
 // Flags: --allow-natives-syntax --noalways-opt
 
-// Test that we throw an error if an object is not passed as argument.
-var non_objects = new Array(undefined, null, 1, -1, 0, 42.43);
+// Test that we return obj if non-object is passed as argument
+var non_objects = new Array(undefined, null, 1, -1, 0, 42.43, Symbol("test"));
 for (var key in non_objects) {
-  var exception = false;
-  try {
-    Object.seal(non_objects[key]);
-  } catch(e) {
-    exception = true;
-    assertTrue(/Object.seal called on non-object/.test(e));
-  }
-  assertTrue(exception);
+  assertSame(non_objects[key], Object.seal(non_objects[key]));
 }
 
+// Test that isFrozen always returns true for non-objects
 for (var key in non_objects) {
-  exception = false;
-  try {
-    Object.isSealed(non_objects[key]);
-  } catch(e) {
-    exception = true;
-    assertTrue(/Object.isSealed called on non-object/.test(e));
-  }
-  assertTrue(exception);
+  assertTrue(Object.isSealed(non_objects[key]));
 }
 
 // Test normal data properties.
 var obj = { x: 42, z: 'foobar' };
 var desc = Object.getOwnPropertyDescriptor(obj, 'x');
 assertTrue(desc.writable);
 assertTrue(desc.configurable);
 assertEquals(42, desc.value);
 
 desc = Object.getOwnPropertyDescriptor(obj, 'z');
@@ skipping 324 matching lines @@
   get: function() { return 42 },
   set: function() { accessorDidRun = true },
   configurable: true,
   enumerable: true
 });
 obj.data = 'foo';
 assertTrue(%HasFastProperties(obj));
 Object.seal(obj);
 assertTrue(%HasFastProperties(obj));
 assertTrue(Object.isSealed(obj));
+
+function Sealed() {}
+Object.seal(Sealed);
+assertDoesNotThrow(function() { return new Sealed(); });
+Sealed.prototype.prototypeExists = true;
+assertTrue((new Sealed()).prototypeExists);