Add helper for unfragmented IPv4 protocol check

This no-op refactoring commit introduces the
addJumpIfNotUnfragmentedIPv4Protocol() helper method to reduce code
duplication and improve readability by centralizing the logic for
checking unfragmented IPv4 protocols.

Test: TH
Change-Id: I4e84f9e11e9ceed2520a5b4b0570047f2f6bb9c0
2 files changed