[Bug sanitizer/78755] Thread sanitizer reports race with std::promise with -O0, works with -O{1,2,3}

[csaba_22 at yahoo dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78755

--- Comment #1 from Csaba Ráduly <csaba_22 at yahoo dot co.uk> ---
Created attachment 40291
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40291&action=edit
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