[vm/io] Ensure ports in SSLFilters are intitialized.
[vm/io] Ensure ports in SSLFilters are intitialized.

This is follow-up to a6dafabb886e0f7195f0be20f04461369130050e where these fields were introduced

Change-Id: I50552092f369b9da4c278bad762129ec19994438
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/165781
Reviewed-by: Siva Annamalai <2e618a8cbd7bb6b3d4409061ae407d692a098546@google.com>
Commit-Queue: Alexander Aprelev <dfb74c35a357c2059971a4bf7fe26b6a7c18085d@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk