Annotate the compiler with information about what it is doing when.

src/librustc_driver/driver.rs

@@ -801,7 +801,7 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
 
                                    time(time_passes,
                                         "rvalue checking",
-                                        || middle::check_rvalues::check_crate(tcx, krate));
+                                        || middle::check_rvalues::check_crate(tcx));
 
                                    // Avoid overwhelming user with errors if type checking failed.
                                    // I'm not sure how helpful this is, to be honest, but it avoids

src/librustc_driver/pretty.rs

@@ -204,6 +204,7 @@ impl PpSourceMode {
                                                         let annotation = TypedAnnotation {
                                                             tcx: tcx,
                                                         };
+                                                        let _ignore = tcx.dep_graph.in_ignore();
                                                         f(&annotation,
                                                           payload,
                                                           &ast_map.forest.krate)