Add a new top level target to build the NNBD fork of the SDK. In its
BUILD.gn file, update all of the paths to not step on the main dart-sdk
directory.
This probably isn't perfect, but it's a first step.
Change-Id: I7ac12a2b174faf6b19d88fff54e3438299577a26
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/117681
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Commit-Queue: Bob Nystrom <rnystrom@google.com>
and remove all references to it in tests and the SDK build scripts.
Change-Id: I728770c460042596ddd14efecdc52bcf0580f592
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/117584
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Siva Annamalai <asiva@google.com>