more cleanup (dropped AST_SwitchBlock)

lib/ast.js

@@ -332,15 +332,11 @@ var AST_Switch = DEFNODE("Switch", "body expression", {
     _walk: function(visitor) {
         return visitor._visit(this, function(){
             this.expression._walk(visitor);
-            this.body._walk(visitor);
+            walk_body(this, visitor);
         });
     }
 }, AST_Statement);
 
-var AST_SwitchBlock = DEFNODE("SwitchBlock", null, {
-    $documentation: "The switch block is somewhat special, hence a special node for it",
-}, AST_Block);
-
 var AST_SwitchBranch = DEFNODE("SwitchBranch", null, {
     $documentation: "Base class for `switch` branches",
 }, AST_Block);