rustc_privacy: Replace `HirId`s and `DefId`s with `LocalDefId`s where possible
rustc_privacy: Replace `HirId`s and `DefId`s with `LocalDefId`s where possible

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