JavaScript tests - fix incorrect TestCase signature, remove tests from slow-n.tests

js/tests/ecma_3/Date/15.9.5.6.js

@@ -127,6 +127,7 @@ test();
 function addTestCase()
 {
   new TestCase(
+    gTestfile,
     status,
     expect,
     actual);

js/tests/slow-n.tests

@@ -6,8 +6,6 @@ e4x/XML/regress-324688.js
 ecma_3/Array/regress-322135-02.js
 ecma_3/Array/regress-322135-03.js
 ecma_3/Array/regress-322135-04.js
-ecma_3/Date/15.9.5.5.js
-ecma_3/Date/15.9.5.6.js
 ecma_3/RegExp/regress-307456.js
 ecma_3/RegExp/regress-330684.js
 js1_5/Array/regress-330812.js