ae34c07b94
This will allow DDC and dart2js to share these values for their async systems. Change-Id: If6eef5de535cdf55e10adca3b2de11c408df4070 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/374520 Reviewed-by: Mark Zhou <markzipan@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com>