Commits on Sep 11, 2019

1. Don't serialize redefined symbol nodes …

   Redefined nodes sometimes have busted internal references (like a self
   argument that has the class as its type even though it won't be able
   to look it up) which can cause crashes. Since they can't have
   references from outside themselves, we don't lose anything by not
   serializing them.
   
   Fixes a crash I observed at Dropbox.
   
   This partially reverts #7413, which introduced this crash (while
   fixing another), but leaves the test case it added.

   

   msullivan committed Sep 11, 2019
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