8164982: Fix legal notices in java/lang, java/net, java/util tests.
Reviewed-by: darcy, iris

8155794: Move Objects.checkIndex BiFunction accepting methods to an internal package
Reviewed-by: chegar, shade, forax, vlivanov

8146458: Improve exception reporting for Objects.checkIndex/checkFromToIndex/checkFromIndexSize
Reviewed-by: jrose, smarks

8142493: Utility methods to check indexes and ranges doesn't specify behavior when function produces null
Reviewed-by: lancea, rriggs, mchung

8135248: Add utility methods to check indexes and ranges
Reviewed-by: forax, chegar, scolebourne, jrose, darcy