Rollup merge of #111618 - cjgillot:name-return-place, r=tmiasko

Always name the return place.

MIR opts more and more consider `_0` as just another local, so there is no point in keeping the special case in debug-info logic.

compiler/rustc_codegen_ssa/src/mir/debuginfo.rs

@@ -328,8 +328,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
 
         let local_ref = &self.locals[local];
 
-        // FIXME Should the return place be named?
-        let name = if bx.sess().fewer_names() || local == mir::RETURN_PLACE {
+        let name = if bx.sess().fewer_names() {
             None
         } else {
             Some(match whole_local_var.or(fallback_var.clone()) {