Fixes for sunflower

lib/runtime/dart/_js_helper.js

 var _js_helper = dart.defineLibrary(_js_helper, {});
 var core = dart.import(core);
 var collection = dart.import(collection);
 var _internal = dart.import(_internal);
 var _foreign_helper = dart.import(_foreign_helper);
 var _js_embedded_names = dart.import(_js_embedded_names);
 var _interceptors = dart.lazyImport(_interceptors);
 var _js_names = dart.import(_js_names);
 var async = dart.import(async);
 var _isolate_helper = dart.lazyImport(_isolate_helper);
@@ skipping 1875 matching lines @@
         hash = Math.random() * 0x3fffffff | 0;
         object.$identityHash = hash;
       }
       return hash;
     }
     static _throwFormatException(string) {
       throw new core.FormatException(string);
     }
     static parseInt(source, radix, handleError) {
       if (handleError == null)
-        handleError = dart.as(Primitives._throwFormatException, __CastType0);
+        handleError = Primitives._throwFormatException;
       checkString(source);
       let match = /^\s*[+-]?((0x[a-f0-9]+)|(\d+)|([a-z0-9]+))\s*$/i.exec(source);
       let digitsIndex = 1;
       let hexIndex = 2;
       let decimalIndex = 3;
       let nonDecimalHexIndex = 4;
       if (radix == null) {
         radix = 10;
         if (match != null) {
           if (dart.dindex(match, hexIndex) != null) {
@@ skipping 31 matching lines @@
           }
         }
       }
       if (match == null)
         return handleError(source);
       return parseInt(source, radix);
     }
     static parseDouble(source, handleError) {
       checkString(source);
       if (handleError == null)
-        handleError = dart.as(Primitives._throwFormatException, __CastType2);
+        handleError = Primitives._throwFormatException;
       if (!/^\s*[+-]?(?:Infinity|NaN|(?:\.\d+|\d+(?:\.\d*)?)(?:[eE][+-]?\d+)?)\s*$/.test(source)) {
         return handleError(source);
       }
       let result = parseFloat(source);
       if (result.isNaN) {
         let trimmed = source.trim();
         if (trimmed == 'NaN' || trimmed == '+NaN' || trimmed == '-NaN') {
           return result;
         }
         return handleError(source);
@@ skipping 306 matching lines @@
       return a == null ? b == null : a === b;
     }
     static extractStackTrace(error) {
       return getTraceFromException(error.$thrownJsError);
     }
   }
   dart.setSignature(Primitives, {
     statics: () => ({
       initializeStatics: [dart.void, [core.int]],
       objectHashCode: [core.int, [core.Object]],
-      _throwFormatException: [core.Object, [core.String]],
+      _throwFormatException: [core.Null, [core.String]],
       parseInt: [core.int, [core.String, core.int, dart.functionType(core.int, [core.String])]],
       parseDouble: [core.double, [core.String, dart.functionType(core.double, [core.String])]],
       formatType: [core.String, [core.String, core.List]],
       objectTypeName: [core.String, [core.Object]],
       objectToString: [core.String, [core.Object]],
       dateNow: [core.num, []],
       initTicker: [dart.void, []],
       currentUri: [core.String, []],
       _fromCharCodeApply: [core.String, [core.List$(core.int)]],
       stringFromCodePoints: [core.String, [core.Object]],
@@ skipping 1861 matching lines @@
   }
   dart.fn(missingMain, dart.void, []);
   function badMain() {
     throw new MainError("'main' is not a function.");
   }
   dart.fn(badMain, dart.void, []);
   function mainHasTooManyParameters() {
     throw new MainError("'main' expects too many parameters.");
   }
   dart.fn(mainHasTooManyParameters, dart.void, []);
-  let __CastType0 = dart.typedef('__CastType0', () => dart.functionType(core.int, [core.String]));
-  let __CastType2 = dart.typedef('__CastType2', () => dart.functionType(core.double, [core.String]));
   // Exports:
   exports.NoSideEffects = NoSideEffects;
   exports.NoThrows = NoThrows;
   exports.NoInline = NoInline;
   exports.IrRepresentation = IrRepresentation;
   exports.Native = Native;
   exports.ConstantMap$ = ConstantMap$;
   exports.ConstantMap = ConstantMap;
   exports.ConstantStringMap$ = ConstantStringMap$;
   exports.ConstantStringMap = ConstantStringMap;
@@ skipping 213 matching lines @@
   exports.jsonEncodeNative = jsonEncodeNative;
   exports.getIsolateAffinityTag = getIsolateAffinityTag;
   exports.LoadLibraryFunctionType = LoadLibraryFunctionType;
   exports.DeferredLoadCallback = DeferredLoadCallback;
   exports.loadDeferredLibrary = loadDeferredLibrary;
   exports.MainError = MainError;
   exports.missingMain = missingMain;
   exports.badMain = badMain;
   exports.mainHasTooManyParameters = mainHasTooManyParameters;
 })(_js_helper, core, collection, _internal, _foreign_helper, _js_embedded_names, _interceptors, _js_names, async, _isolate_helper);