remove a use of core::intrinsics::size_of
          #1947
        
          
      
                
     Merged
            
            
          
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use of the intrinsic, rather than the stable function, is probably an accident.
This import was unused since #1945. That fix was needed because we ran into rust-lang/rust#148104. That makes sense in retrospect, the intrinsic should not be used in normal code where
core::mem::size_ofis available.