e26a8109ea
Derive whether legacy and nullable types are emitted based on the provided sdk libraries and only enable the non-nullable experiment when building the platform files. The test matrix continues to enable the experiment temporarily because test_runner currently doesn't support running with the ReleaseX64NNBD configuration if it is not enabled in test.py Change-Id: I7322906e928c68acab77087bcba76f06ef4bf983 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/141850 Reviewed-by: Stephen Adams <sra@google.com> Commit-Queue: Sigmund Cherem <sigmund@google.com>