Reland https://dart-review.googlesource.com/c/sdk/+/84683
Reland https://dart-review.googlesource.com/c/sdk/+/84683

The timeout issue in app-kernel-linux-product-x64-try seems to have resolved itself.

Bug: https://github.com/dart-lang/sdk/issues/34895
Change-Id: If503aa4e63628c38d8ee86a5b6b5202ea953d6a8
Reviewed-on: https://dart-review.googlesource.com/c/85406
Reviewed-by: Ryan Macnak <d738b7f001baf9789095d7dc549cff6de60b011d@google.com>
Commit-Queue: Liam Appelbe <78c2029e58e395825ba7228e218c841bb436a9e9@google.com>

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