Add intern table for `List<PlaceElem<'tcx>>`
Add intern table for `List<PlaceElem<'tcx>>`

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