[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 #1 from Maria Matejka <mq at ucw dot cz> ---
Created attachment 46951
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46951&action=edit
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