dart2js checked mode failures in drt after dart:typeddata

[madsager]

FAILED: dart2js-drt-checked release_ia32 html/postmessage_structured_test/typed_arrays
FAILED: dart2js-drt-checked release_ia32 html/postmessage_structured_test/primitives

In both cases:

ERROR Uncaught error: type 'Uint8Array' is not a subtype of type 'ByteBuffer'

[kasperl]

Added this to the Later milestone.

[kasperl]

Added TriageForM5 label.

[kasperl]

Removed TriageForM5 label.

[rakudrama]

Uint8List should not be a subtype of ByteBuffer.

The test is incorrectly written:

    var array_buffer = new Uint8List(16);

should be:

    var array_buffer = new Uint8List(16).buffer;

This test passes by accident on Dartium dur to issue #10136

---

Marked this as being blocked by #10136.

[kasperl]

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

[kasperl]

Removed Oldschool-Milestone-Later label.