disabled default optimizations pending bugfix

compile.py

@@ -15,8 +15,9 @@ def exec_opt(inputs, outputs, features=[]):
 exec_opt.optimizer = None
 
 def default_optimizer(env):
-    default_optimizer.const(env)
-    default_optimizer.merge(env)
+    #TODO: pass tests with these un-commented
+    #default_optimizer.const(env)
+    #default_optimizer.merge(env)
     pass
 default_optimizer.merge = gof.opt.MergeOptimizer()
 default_optimizer.const = gof.opt.ConstantFinder()