When metadata is not requested, elide unneeded signatures

pkg/dev_compiler/test/codegen_expected/closure.js

 export const closure = Object.create(null);
 import { core, js, dart, dartx } from 'dart_sdk';
 let dynamic__Toint = () => (dynamic__Toint = dart.constFn(dart.functionType(core.int, [dart.dynamic], [dart.dynamic])))();
 let dynamic__Todynamic = () => (dynamic__Todynamic = dart.constFn(dart.functionType(dart.dynamic, [dart.dynamic], {y: core.String, z: dart.dynamic})))();
 let StringToList = () => (StringToList = dart.constFn(dart.functionType(core.List, [core.String])))();
 let ListOfint = () => (ListOfint = dart.constFn(core.List$(core.int)))();
 let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.functionType(dart.dynamic, [dart.dynamic])))();
 let FnToListOfint = () => (FnToListOfint = dart.constFn(dart.functionType(ListOfint(), [dynamicTodynamic()])))();
 let MapOfMap$Map = () => (MapOfMap$Map = dart.constFn(core.Map$(core.Map, core.Map)))();
 let Foo = () => (Foo = dart.constFn(closure.Foo$()))();
@@ skipping 46 matching lines @@
       return null;
     }
     set prop(value: string) {}
     static get staticProp() {
       return null;
     }
     static set staticProp(value: string) {}
   }
   dart.addTypeTests(Foo);
   dart.setSignature(Foo, {
-    constructors: () => ({
-      new: dart.definiteFunctionType(closure.Foo$(T), [core.int, T]),
-      build: dart.definiteFunctionType(closure.Foo$(T), [])
-    }),
     fields: () => ({
       i: core.int,
       b: core.bool,
       s: core.String,
       v: T
     }),
     getters: () => ({prop: dart.definiteFunctionType(core.String, [])}),
     setters: () => ({prop: dart.definiteFunctionType(dart.void, [core.String])}),
     methods: () => ({
       untyped_method: dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic]),
       pass: dart.definiteFunctionType(T, [T]),
       typed_method: dart.definiteFunctionType(core.String, [closure.Foo, core.List, core.int, core.num, core.double, core.bool, core.String, js.JsArray, js.JsObject, js.JsFunction]),
       optional_params: dart.definiteFunctionType(dart.dynamic, [dart.dynamic], [dart.dynamic, core.int]),
       nullary_method: dart.definiteFunctionType(dart.dynamic, []),
       function_params: dart.definiteFunctionType(dart.dynamic, [dynamic__Toint(), dynamic__Todynamic(), closure.Callback]),
       run: dart.definiteFunctionType(dart.dynamic, [core.List, core.String, StringToList(), FnToListOfint()], {h: MapOfMap$Map()})
     }),
-    sfields: () => ({
-      some_static_constant: core.String,
-      some_static_final: core.String,
-      some_static_var: core.String
-    }),
-    sgetters: () => ({staticProp: dart.definiteFunctionType(core.String, [])}),
-    ssetters: () => ({staticProp: dart.definiteFunctionType(dart.void, [core.String])}),
     statics: () => ({named_params: dart.definiteFunctionType(dart.dynamic, [dart.dynamic], {b: dart.dynamic, c: core.int})}),
     names: ['named_params']
   });
   return Foo;
 });
 closure.Foo = Foo();
 /** @final {string} */
 closure.Foo.some_static_constant = "abc";
 /** @final {string} */
 closure.Foo.some_static_final = "abc";
 /** @type {string} */
 closure.Foo.some_static_var = "abc";
 closure.Bar = class Bar extends core.Object {};
 closure.Baz = class Baz extends dart.mixin(closure.Foo$(core.int), closure.Bar) {
   new(i: number) {
     super.new(i, 123);
   }
 };
 dart.addSimpleTypeTests(closure.Baz);
-dart.setSignature(closure.Baz, {
-  constructors: () => ({new: dart.definiteFunctionType(closure.Baz, [core.int])})
-});
 closure.main = function(args): void {
 };
 dart.fn(closure.main, dynamicTovoid());
 dart.defineLazy(closure, {
   get closure() {
     return dart.fn((): core.Null => {
       return;
     }, VoidToNull());
   },
   set closure(_) {}
 });
 /** @final {string} */
 closure.some_top_level_constant = "abc";
 /** @final {string} */
 closure.some_top_level_final = "abc";
 /** @type {string} */
 closure.some_top_level_var = "abc";