Annotate fork handling with PERFETTO_UNLIKELY.
Annotate fork handling with PERFETTO_UNLIKELY.

We disconnect in that case, so this happens at most once per profile
session.

Bug: 126724929
Change-Id: Ied0b42314edc74b38ed3aab21b1dfd44b2230019
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto