b59583edea
This is a reland of b4146411d0
Original change's description:
> [VM/SDK]
>
> - Switch the kernel isolate to run in Dart2 mode
> - Refactor build rules so bootstrapping of the front end happens
> with a prebuilt dart sdk
> - Refactor application snapshot build rules so the kernel application
> snapshot rule does not get into a cyclic dependency during the
> bootstrap stage
>
> Change-Id: Id16b2859e0b299b2d689971d03a247cb94d0aa26
> Reviewed-on: https://dart-review.googlesource.com/61660
> Commit-Queue: Siva Annamalai <asiva@google.com>
> Reviewed-by: Zach Anderson <zra@google.com>
Change-Id: I2a3fa8ed4f331cf3de89ddff5cf8e478809dae39
Reviewed-on: https://dart-review.googlesource.com/65841
Reviewed-by: Siva Annamalai <asiva@google.com>