[Bug go/66303] runtime.Caller() returns infinitely deep stack frames on s390x

[vogt at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66303

--- Comment #6 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
Ah, forget it, the addresses are okay; I'll dig deeper into the code.