grep: rename --allfiles to --all-files
This matches the config name to be added.
Note that we don't have to keep the old flag since it isn't released yet.
Differential Revision: https://phab.mercurial-scm.org/D3915
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2