Unexpected changes of CurrentResourceOwner and CurrentMemoryContext

When working on the REPACK command, we see an ERROR caused by unexpected
change of CurrentResourceOwner [1]. I think the problem is that
reorderbuffer.c does not restore the original value after calling
RollbackAndReleaseCurrentSubTransaction(). The attached patch tries to handle
the call like other callers throughout the tree do.

[1]
https://www.postgresql.org/message-id/CADzfLwUgPMLiFkXRnk97ugPqkDfsNJ3TRdw9gjJM%3D8WB4_nXwQ%40mail.gmail.com

-- 
Antonin Houska
Web: https://www.cybertec-postgresql.com