perf: add a command to benchmark linelog edits
The use pattern of creating a linelog is usually by calling "replacelines"
multiple times. Add a command to benchmark it.
Differential Revision: https://phab.mercurial-scm.org/D4148
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2