Handle aliasing a non-top-level command. #5585
Merged
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This didn't work previously because we had to check whether the incoming command was an alias command, but if it wasn't we still used the result of that lookup - which was by the command's node name. That fails for non-top-level commands. In this case, the resolution is pretty simple since we already have the node's CommandObject, so all we needed to do was turn it into a shared pointer, for which I added enable_shared_from_this to the CommandObject.
Differential Revision: https://reviews.llvm.org/D137662
(cherry picked from commit d518ed4)