Fixes #254 - Better stacktrace support

lib/runtime/dart/typed_data.js

 dart_library.library('dart/typed_data', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core'
 ], /* Lazy imports */[
   'dart/_native_typed_data'
 ], function(exports, dart, core, _native_typed_data) {
   'use strict';
   let dartx = dart.dartx;
   class ByteBuffer extends core.Object {}
   class TypedData extends core.Object {}
@@ skipping 196 matching lines @@
   dart.setSignature(Uint32List, {
     constructors: () => ({
       new: [Uint32List, [core.int]],
       fromList: [Uint32List, [core.List$(core.int)]],
       view: [Uint32List, [ByteBuffer], [core.int, core.int]]
     })
   });
   Uint32List.BYTES_PER_ELEMENT = 4;
   class Int64List extends core.Object {
     static new(length) {
-      throw new core.UnsupportedError("Int64List not supported by dart2js.");
+      dart.throw(new core.UnsupportedError("Int64List not supported by dart2js."));
     }
     static fromList(elements) {
-      throw new core.UnsupportedError("Int64List not supported by dart2js.");
+      dart.throw(new core.UnsupportedError("Int64List not supported by dart2js."));
     }
     static view(buffer, offsetInBytes, length) {
       if (offsetInBytes === void 0)
         offsetInBytes = 0;
       if (length === void 0)
         length = null;
       return buffer.asInt64List(offsetInBytes, length);
     }
   }
   Int64List[dart.implements] = () => [core.List$(core.int), TypedData];
   dart.setSignature(Int64List, {
     constructors: () => ({
       new: [Int64List, [core.int]],
       fromList: [Int64List, [core.List$(core.int)]],
       view: [Int64List, [ByteBuffer], [core.int, core.int]]
     })
   });
   Int64List.BYTES_PER_ELEMENT = 8;
   class Uint64List extends core.Object {
     static new(length) {
-      throw new core.UnsupportedError("Uint64List not supported by dart2js.");
+      dart.throw(new core.UnsupportedError("Uint64List not supported by dart2js."));
     }
     static fromList(elements) {
-      throw new core.UnsupportedError("Uint64List not supported by dart2js.");
+      dart.throw(new core.UnsupportedError("Uint64List not supported by dart2js."));
     }
     static view(buffer, offsetInBytes, length) {
       if (offsetInBytes === void 0)
         offsetInBytes = 0;
       if (length === void 0)
         length = null;
       return buffer.asUint64List(offsetInBytes, length);
     }
   }
   Uint64List[dart.implements] = () => [core.List$(core.int), TypedData];
@@ skipping 719 matching lines @@
   exports.Uint64List = Uint64List;
   exports.Float32List = Float32List;
   exports.Float64List = Float64List;
   exports.Float32x4List = Float32x4List;
   exports.Int32x4List = Int32x4List;
   exports.Float64x2List = Float64x2List;
   exports.Float32x4 = Float32x4;
   exports.Int32x4 = Int32x4;
   exports.Float64x2 = Float64x2;
 });