Revamp RealFileName public methods

compiler/rustc_save_analysis/src/dump_visitor.rs

@@ -190,7 +190,7 @@ impl<'tcx> DumpVisitor<'tcx> {
         };
 
         let data = CompilationOptions {
-            directory: self.tcx.sess.working_dir.stable_name().into(),
+            directory: self.tcx.sess.working_dir.remapped_path_if_available().into(),
             program,
             arguments,
             output: self.save_ctxt.compilation_output(crate_name),

compiler/rustc_save_analysis/src/span_utils.rs

@@ -26,7 +26,12 @@ impl<'a> SpanUtils<'a> {
                         .display()
                         .to_string()
                 } else {
-                    self.sess.working_dir.stable_name().join(&path).display().to_string()
+                    self.sess
+                        .working_dir
+                        .remapped_path_if_available()
+                        .join(&path)
+                        .display()
+                        .to_string()
                 }
             }
             // If the file name was remapped, we assume the user