Add types to shift operations

lib/runtime/dart/_interceptors.js

 var _interceptors = dart.defineLibrary(_interceptors, {});
 var core = dart.import(core);
 var _js_helper = dart.lazyImport(_js_helper);
 var _internal = dart.import(_internal);
 var _foreign_helper = dart.import(_foreign_helper);
 var _js_embedded_names = dart.import(_js_embedded_names);
 (function(exports, core, _js_helper, _internal, _foreign_helper, _js_embedded_names) {
   'use strict';
   let JSArray = Array;
   let JSMutableArray$ = dart.generic(function(E) {
@@ skipping 427 matching lines @@
     }
     get bitLength() {
       let nonneg = this['<'](0) ? dart.notNull(this['unary-']()) - 1 : this;
       if (dart.notNull(nonneg) >= 4294967296) {
         nonneg = (dart.notNull(nonneg) / 4294967296).truncate();
         return dart.notNull(JSInt._bitCount(JSInt._spread(nonneg))) + 32;
       }
       return JSInt._bitCount(JSInt._spread(nonneg));
     }
     static _bitCount(i) {
-      i = dart.as(dart.dsend(JSInt._shru(i, 0), '-', dart.dsend(JSInt._shru(i, 1), '&', 1431655765)), core.int);
-      i = (dart.notNull(i) & 858993459)['+'](dart.as(dart.dsend(JSInt._shru(i, 2), '&', 858993459), core.num));
-      i = 252645135 & dart.notNull(dart.notNull(i) + dart.notNull(dart.as(JSInt._shru(i, 4), core.num)));
-      i = dart.notNull(i) + dart.notNull(dart.as(JSInt._shru(i, 8), core.int));
-      i = dart.notNull(i) + dart.notNull(dart.as(JSInt._shru(i, 16), core.int));
+      i = dart.notNull(JSInt._shru(i, 0)) - (dart.notNull(JSInt._shru(i, 1)) & 1431655765);
+      i = (dart.notNull(i) & 858993459) + (dart.notNull(JSInt._shru(i, 2)) & 858993459);
+      i = 252645135 & dart.notNull(i) + dart.notNull(JSInt._shru(i, 4));
+      i = dart.notNull(i) + dart.notNull(JSInt._shru(i, 8));
+      i = dart.notNull(i) + dart.notNull(JSInt._shru(i, 16));
       return dart.notNull(i) & 63;
     }
     static _shru(value, shift) {
       return value >>> shift;
     }
     static _shrs(value, shift) {
       return value >> shift;
     }
     static _ors(a, b) {
       return a | b;
     }
     static _spread(i) {
-      i = dart.as(JSInt._ors(i, dart.as(JSInt._shrs(i, 1), core.int)), core.int);
-      i = dart.as(JSInt._ors(i, dart.as(JSInt._shrs(i, 2), core.int)), core.int);
-      i = dart.as(JSInt._ors(i, dart.as(JSInt._shrs(i, 4), core.int)), core.int);
-      i = dart.as(JSInt._ors(i, dart.as(JSInt._shrs(i, 8), core.int)), core.int);
-      i = dart.as(JSInt._shru(dart.as(JSInt._ors(i, dart.as(JSInt._shrs(i, 16), core.int)), core.int), 0), core.int);
+      i = JSInt._ors(i, JSInt._shrs(i, 1));
+      i = JSInt._ors(i, JSInt._shrs(i, 2));
+      i = JSInt._ors(i, JSInt._shrs(i, 4));
+      i = JSInt._ors(i, JSInt._shrs(i, 8));
+      i = JSInt._shru(JSInt._ors(i, JSInt._shrs(i, 16)), 0);
       return i;
     }
     get runtimeType() {
       return core.int;
     }
     ['~']() {
       return dart.as(~this >>> 0, core.int);
     }
   }
   JSInt[dart.implements] = () => [core.int, core.double];
   dart.setSignature(JSInt, {
     methods: () => ({
       toUnsigned: dart.functionType(core.int, [core.int]),
       toSigned: dart.functionType(core.int, [core.int]),
       '~': dart.functionType(core.int, [])
     }),
     statics: () => ({
       _bitCount: dart.functionType(core.int, [core.int]),
-      _shru: dart.functionType(dart.dynamic, [core.int, core.int]),
-      _shrs: dart.functionType(dart.dynamic, [core.int, core.int]),
-      _ors: dart.functionType(dart.dynamic, [core.int, core.int]),
+      _shru: dart.functionType(core.int, [core.int, core.int]),
+      _shrs: dart.functionType(core.int, [core.int, core.int]),
+      _ors: dart.functionType(core.int, [core.int, core.int]),
       _spread: dart.functionType(core.int, [core.int])
     }),
     names: ['_bitCount', '_shru', '_shrs', '_ors', '_spread']
   });
   class JSDouble extends JSNumber {
     JSDouble() {
       super.JSNumber();
     }
     get runtimeType() {
       return core.double;
@@ skipping 719 matching lines @@
   exports.findInterceptorForType = findInterceptorForType;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
   exports.JSIndexable = JSIndexable;
   exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 })(_interceptors, core, _js_helper, _internal, _foreign_helper, _js_embedded_names);