use pass infrastructure for mir shims, so that they can get dumped
use pass infrastructure for mir shims, so that they can get dumped

aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust