tests: work around `tac` not being portable

Authored by durin42.

Description

tests: work around tac not being portable

Introduce a tac.py helper and use it. Sigh.

Differential Revision: https://phab.mercurial-scm.org/D5238

Details

Committed
durin42Wed, Nov 7, 12:15 PM
Differential Revision
D5238: tests: work around `tac` not being portable
Parents
rHGe5ad3ef90aa1: revlog: give formatting to clang-format
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