[Bug target/107713] Wrong implementation atomic_exchange on LoongArch

[hejinyang at loongson dot cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107713

--- Comment #1 from Jinyang He <hejinyang at loongson dot cn> ---
Created attachment 53906
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53906&action=edit
a simple test