[Bug libgomp/69555] libgomp.c++/target-6.C fails because of undefined behaviour

[vogt at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69555

--- Comment #11 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
Successfully bootstrapped and regression tested on s390x biarch.
Thanks.