Move generated files to gen/.

test/codegen/expect/varargs.js

Index: test/codegen/expect/varargs.js
diff --git a/test/codegen/expect/varargs.js b/test/codegen/expect/varargs.js
deleted file mode 100644
index b4aa43ac8369d2a9b45b8ddcfe9163914b2e38fc..0000000000000000000000000000000000000000
--- a/test/codegen/expect/varargs.js
+++ /dev/null
@@ -1,21 +0,0 @@
-dart_library.library('varargs', null, /* Imports */[
-  'dart_sdk'
-], function(exports, dart_sdk) {
-  'use strict';
-  const core = dart_sdk.core;
-  const dart = dart_sdk.dart;
-  const dartx = dart_sdk.dartx;
-  const varargs = Object.create(null);
-  varargs.varargsTest = function(x, ...others) {
-    let args = [1, others];
-    dart.dsend(x, 'call', ...args);
-  };
-  dart.fn(varargs.varargsTest);
-  varargs.varargsTest2 = function(x, ...others) {
-    let args = [1, others];
-    dart.dsend(x, 'call', ...args);
-  };
-  dart.fn(varargs.varargsTest2);
-  // Exports:
-  exports.varargs = varargs;
-});