[Bug target/102107] protocol register (r12) corrupted before a tail call

[pc at us dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102107

--- Comment #8 from Paul Clarke <pc at us dot ibm.com> ---
$ /opt/at15.0/bin/gcc --version
gcc (GCC) 11.2.1 20210802 (Advance-Toolchain 15.0-0) [ebcfb7a665c2]