tree eb96e875f3eff91adf45f85c994eb6fb8a2f5fac
parent cc79f776dcb09164e7a0b6c11951679244a7828b
author Mark Hansen <markhansen@google.com> 1714698815 -0700
committer Copybara-Service <copybara-worker@google.com> 1714698932 -0700

Java full runtime: Avoid allocating iterator if UnknownFieldSet's TreeMap is empty

I also considered using Collections.emptyNavigableMap(), which I thought might
use a specialized allocation free empty iterator, but it allocates, and its
clone() method isn't nicely exposed.

PiperOrigin-RevId: 630234849