Attach type info to extension method and object method tear-offs

test/codegen/expect/methods.js

 dart_library.library('methods', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core'
 ], /* Lazy imports */[
 ], function(exports, dart, core) {
   'use strict';
   let dartx = dart.dartx;
   let _c = Symbol('_c');
   class A extends core.Object {
     A() {
@@ skipping 57 matching lines @@
       this.bar = new Bar();
     }
   }
   function test() {
     let f = new Foo();
     dart.dcall(f.bar, "Bar's call method!");
     let a = new A();
     let g = dart.bind(a, 'x');
     let aa = new A();
     let h = dart.dload(aa, 'x');
+    let ts = dart.fn(dart.toString.bind(a), core.String, []);
+    let nsm = dart.fn(dart.noSuchMethod.bind(a), dart.dynamic, [core.Invocation]);
+    let c = dart.bind("", dartx.padLeft);
+    let r = dart.bind(3.0, dartx.floor);
   }
   dart.fn(test);
   // Exports:
   exports.A = A;
   exports.Bar = Bar;
   exports.Foo = Foo;
   exports.test = test;
 });