Revert revision 40228

This is making us crash across platforms in debug mode, see e.g., 
http://build.chromium.org/p/client.dart/builders/vm-linux-debug-x64-be/builds/2967

Review URL: https://codereview.chromium.org//564143003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40231 260f80e4-7a28-3924-810f-c04153c831b5
Call special VM interpolate for single element interpolation.

Fixed at the intermediate language level.

R=fschneider@google.com

Review URL: https://codereview.chromium.org//563973004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40232 260f80e4-7a28-3924-810f-c04153c831b5
dart2js: Remove dead code.

R=sigurdm@google.com

Review URL: https://codereview.chromium.org//547263003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40233 260f80e4-7a28-3924-810f-c04153c831b5