JavaScript Tests - update slow-n.tests, remove e4x/Regress/regress-350531.js, add js1_5/GC/regress-319980-01.js, js1_5/GC/regress-338653.js, no bug, not part of the build

js/tests/slow-n.tests

@@ -1,7 +1,6 @@
 e4x/GC/regress-324278.js
 e4x/Regress/regress-319872.js
 e4x/Regress/regress-350238.js
-e4x/Regress/regress-350531.js
 e4x/XML/regress-324422-2.js
 e4x/XML/regress-324688.js
 ecma_3/Array/regress-322135-02.js
@@ -15,6 +14,8 @@ js1_5/Array/regress-330812.js
 js1_5/Array/regress-350256-03.js
 js1_5/Function/regress-338121-01.js
 js1_5/Function/regress-338121-02.js
+js1_5/GC/regress-319980-01.js
+js1_5/GC/regress-338653.js
 js1_5/GC/regress-346794.js
 js1_5/Regress/regress-271716-n.js
 js1_5/Regress/regress-312588.js