tests/test-rollback

revlogio: speed up parsing

- precalcuate ending offset
- pull some variables into local scope
- separate inline and out of line code paths

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg verify
hg parents
hg status
hg rollback
hg verify
hg parents
hg status