Remove the everybody loops pass

It isn't used anymore by rustdoc

compiler/rustc_session/src/options.rs

@@ -1491,7 +1491,6 @@ options! {
         `normal`, `identified`,
         `expanded`, `expanded,identified`,
         `expanded,hygiene` (with internal representations),
-        `everybody_loops` (all function bodies replaced with `loop {}`),
         `ast-tree` (raw AST before expansion),
         `ast-tree,expanded` (raw AST after expansion),
         `hir` (the HIR), `hir,identified`,