configitems: traverse sections deterministically
Otherwise output can be non-deterministic if there are warnings
for multiple sections.
Differential Revision: https://phab.mercurial-scm.org/D1947
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false