fixing an issue with iffalse (jz not working properly, changed to je)

CodeGenUtils.py

@@ -102,7 +102,8 @@ def iffalse(cond, label):
     if cond.__class__.__name__ == "NameNode":
         cond.codeGen()
         result += cond.code
-        result += p("jz", label)
+        result += p(instruction="cmp", arg1="eax", arg2=0, comment="comparing eax with 0")
+        result += p(instruction="je", arg1=label)
         return result
 
     val = cond.getConstant()