rustc_ast: `visit_mac` -> `visit_mac_call`
rustc_ast: `visit_mac` -> `visit_mac_call`

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