Fixes #254 - Better stacktrace support

lib/runtime/dart/typed_data.js

Index: lib/runtime/dart/typed_data.js
diff --git a/lib/runtime/dart/typed_data.js b/lib/runtime/dart/typed_data.js
index b6e6cd5b45fd85387ba6c250d32bf658ee21f8e9..aff34396350cfcc4ee61dc91bc3c532bdc1821f5 100644
--- a/lib/runtime/dart/typed_data.js
+++ b/lib/runtime/dart/typed_data.js
@@ -214,10 +214,10 @@ dart_library.library('dart/typed_data', null, /* Imports */[
   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)
@@ -238,10 +238,10 @@ dart_library.library('dart/typed_data', null, /* Imports */[
   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)