revlog: add public CPython function to get parent revisions
Since this is a public function, it validates the input revision, and supports
nullrev. index_get_parents_checked() will be replaced by this function.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false