toolchain/57033: usr.bin/c++/t_call_once2:call_once2_profile test case fails

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         57033
>Category:       toolchain
>Synopsis:       usr.bin/c++/t_call_once2:call_once2_profile test case fails
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 28 09:40:00 +0000 2022
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2022.06.12.15.08.38
>Organization:
  
>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

For the last few months, only a single test case has been consistently
failing in every run of the TNF i386 testbed.  This is the
call_once2_profile test case of the usr.bin/c++/t_call_once2 test,
which was previously marked as an "expected failure", but changed into
a plain (unexpected) failure with this commit:

  2022.06.12.15.08.38 skrll src/tests/usr.bin/c++/t_call_once.sh 1.6
  2022.06.12.15.08.38 skrll src/tests/usr.bin/c++/t_call_once2.sh 1.6
  2022.06.12.15.08.38 skrll src/tests/usr.bin/c++/t_cxxruntime.sh 1.7
  2022.06.12.15.08.38 skrll src/tests/usr.bin/c++/t_hello.sh 1.7
  2022.06.12.15.08.38 skrll src/tests/usr.bin/c++/t_pthread_once.sh 1.6
  2022.06.12.15.08.38 skrll src/tests/usr.bin/c++/t_static_destructor.sh 1.6
  2022.06.12.15.08.38 skrll src/tests/usr.bin/cc/t_hello.sh 1.12

Also, it previously failed quickly, but is now taking ten minutes to
fail, thereby significantly increasing the overall run time of the
tests.

It also fails on other architectures including amd64, and on real
hardware.

>How-To-Repeat:

Run the ATF tests.

>Fix: