vitalybuka added a comment.

Intrinsics are invalid there, code is generated in such way that variable is 
being accessed after lifetime.end.
I suspect that optimizer can make invalid code because of this, but I can't 
So I think it's safer to remove them at all and don't wait for miscompile 

Still if performance is greater concern than potential miscompiles, I can limit 
this only to asan-use-after-scope.

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