[Bug target/109933] __atomic_test_and_set is broken for BIG ENDIAN riscv targets

[patrick at rivosinc dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109933

--- Comment #4 from Patrick O'Neill <patrick at rivosinc dot com> ---
Sorry about the nonsense comment, I clicked enter too early. I'm taking a look
at this.