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revlog: fix error about unknown compression format in py3

Description

revlog: fix error about unknown compression format in py3

In py2, the error is something like:
abort: unknown compression type 'x'!

In py3, we get the following unhelpful message:
abort: unknown compression type <memory at 0x7f4650b5cdc8>!

Switch to something like:
abort: unknown compression type 78!

Differential Revision: https://phab.mercurial-scm.org/D10318