Reenable pytype attribute errors in env

Pytype complains that attribute errors are not reenabled after a
temporary disable. This patch fixes that be reenabling them so that it
stops throwing the warning while also potentially improving coverage of
the code if more is added in the future.

compiler_opt/rl/env.py

@@ -359,6 +359,7 @@ def reset(self, module: corpus.LoadedModuleSpec):
     self._clang_generator.send(None)
     # pytype: disable=attribute-error
     self._iclang, self._clang = self._clang_generator.send(module)
+    # pytype: enable=attribute-error
     return self._get_observation()
 
   def step(self, action: np.ndarray):