Use a constant instead of int.parse("0x10ffff")

BUG=
R=terry@google.com

Review URL: https://codereview.chromium.org//651513003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41431 260f80e4-7a28-3924-810f-c04153c831b5
Perform interceptor simplification on interceptors passed in super calls

BUG=
R=floitsch@google.com

Review URL: https://codereview.chromium.org//687423003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41432 260f80e4-7a28-3924-810f-c04153c831b5