asyncio pgo + lto buildbot failure: altered environment

[sobolevn]

There's a new buildbot failure: https://buildbot.python.org/all/#builders/244/builds/3091

== Tests result: ENV CHANGED ==
414 tests OK.
10 slowest tests:
- test_tools: 3 min 18 sec
- test_concurrent_futures: 2 min 29 sec
- test_multiprocessing_spawn: 2 min
- test_multiprocessing_forkserver: 1 min 38 sec
- test_unparse: 1 min 24 sec
- test_asyncio: 1 min 10 sec
- test_multiprocessing_fork: 1 min 8 sec
- test_tokenize: 1 min 8 sec
- test_unicodedata: 56.2 sec
- test_signal: 48.6 sec
1 test altered the execution environment:
    test_asyncio
22 tests skipped:
    test_devpoll test_gdb test_idle test_ioctl test_kqueue
    test_launcher test_msilib test_perf_profiler test_smtpnet test_ssl
    test_startfile test_tcl test_tix test_tkinter test_ttk
    test_ttk_textonly test_turtle test_winconsoleio test_winreg
    test_winsound test_wmi test_zipfile64
Total duration: 6 min 22 sec
Tests result: ENV CHANGED
make: *** [buildbottest] Error 3
program finished with exit code 2
elapsedTime=383.679571

[kumaraditya303]

Subsequent two builds have passed https://buildbot.python.org/all/#/builders/244/builds/3093 so I assume it was just a random flaky failure. Feel free to reopen if this happens again.

[gvanrossum]

Maybe we should create a new issue to try and find and fix the reasons why test_asyncio is so flaky? I've run into this many times.

[sobolevn]

Will do!