Hopefully this bug is getting handled upstream in a microcode update or a compiler fix to avoid emitting such instructions. Just a comment mentioning that you should not emit a particular instruction is not a strong guarantee.
According to https://bugzilla.mozilla.org/show_bug.cgi?id=1950764#c23 , it is not getting fixed.
According to https://bugzilla.mozilla.org/show_bug.cgi?id=1950764#c23 , it is not getting fixed.