cmd/go: allow either test to complete first in TestScript/test_chatty_parallel_success_run
This fixes a failure mode observed in
https://build.golang.org/log/
7b28a914b1914dabe94f7c4e36ad6466ebd4de5d,
in which the expected CONT lines are present but the test completions
are reported in a different (but valid) order.
CONT lines are only printed between interleaved output lines, so if
the ordering of the tests swaps after all output is already generated
the PASS lines can be in arbitrary order.
Fixes #51221 (again).
Change-Id: I051f8ec4331e2e3ab1bb00a7c188c322ad4e0a03
Reviewed-on: https://go-review.googlesource.com/c/go/+/397194
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>