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

[pc at us dot ibm.com via Gcc-bugs]

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

--- Comment #2 from Paul Clarke <pc at us dot ibm.com> ---
Created attachment 51369
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51369&action=edit
creduced version (tiny, but ugly)