add source mappings for more node types; started CLI utility

tmp/test-maps.js

@@ -28,8 +28,10 @@ function do_file(file) {
 
     // generate source into the output stream
     // first reset the current file name in the source map.
-    map.set_source(file);
-    ast.print(output);
+    UglifyJS.time_it("generate", function(){
+        map.set_source(file);
+        ast.print(output);
+    });
 };
 
 files.forEach(do_file);

tmp/test-node.js

@@ -22,7 +22,7 @@ time_it("scope", function(){
     ast.figure_out_scope();
 });
 
-ast.scope_warnings();
+// ast.scope_warnings();
 
 time_it("mangle", function(){
     ast.mangle_names();