Don't call `diag_span_note_once` for suppressed lints
Don't call `diag_span_note_once` for suppressed lints

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