[IO] Don't throw ERANGE for arguments out of range

[fredemmott]

• Was inconsistently sometimes using EINVAL, sometimes using ERANGE
• ERANGE is for result out of valid range, not inputs
• EINVAL allows consistent handling of errors regardless of argument type

refs #143

[facebook-github-bot]

@fredemmott merged this pull request in hhvm/hsl-experimental@b85dbc435c445fca727e32e98ed58cbbbceca212.