remove legacy generator options

lib/6to5/file.js

@@ -80,6 +80,7 @@ File.prototype.addDeclaration = function (name) {
 
 File.prototype.parse = function (code) {
   var self = this;
+  this.code = code;
 
   code = this.parseShebang(code);
 
@@ -103,13 +104,7 @@ File.prototype.generate = function () {
   var opts = this.opts;
   var ast  = this.ast;
 
-  var printOpts = {};
-
-  if (opts.sourceMap) {
-    printOpts.sourceMapName = opts.sourceMapName;
-  }
-
-  var result = generate(ast, printOpts);
+  var result = generate(this.code, ast, opts);
 
   if (this.shebang) {
     // add back shebang