mark a few testcase failures as known issues (not to be fixed in 1.0)

ecmascript-testcases/test-bug-tonumber-u0000.js

@@ -3,6 +3,12 @@
 NaN
 ===*/
 
+/*---
+{
+    "knownissue": true
+}
+---*/
+
 /* An empty string ToNumber() coerces to +0 (this is explicitly specified).
  * A string which cannot be interpreted as a StringNumericLiteral must
  * produce a NaN.

ecmascript-testcases/test-dev-func-cons-args.js

@@ -8,6 +8,12 @@
  *  too!
  */
 
+/*---
+{
+    "knownissue": true
+}
+---*/
+
 /*===
 6
 6