Mark try/web/end_to_end_test slow on safarimobilesim

This is timing all on almost every commit

R=ahe@google.com

Review URL: https://codereview.chromium.org//724393002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41738 260f80e4-7a28-3924-810f-c04153c831b5
Skip timing out tests on IE

R=whesse@google.com

Review URL: https://codereview.chromium.org//724823006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41739 260f80e4-7a28-3924-810f-c04153c831b5
Fix overflow check in the Smi::ShiftOp.

It did not work correctly for the corner case like -1 << 63.

BUG=
R=fschneider@google.com

Review URL: https://codereview.chromium.org//732573002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41740 260f80e4-7a28-3924-810f-c04153c831b5