[Bug c/91918] Const pointer argument to atomic_compare_exchange doesn't cause an error.

[mq at ucw dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91918

--- Comment #2 from Maria Matejka <mq at ucw dot cz> ---
Created attachment 46952
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46952&action=edit
generated assembler code