[Bug target/118280] [14/15/16 Regression] __atomic_test_and_set in Microblaze are broken (exposed by r14-4286)

[eager at eagercon dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118280

--- Comment #17 from Michael Eager <eager at eagercon dot com> ---
The reproducer script builds gcc-13, not v14 or v15.  

There have been no changes to microblaze support in gcc-15.