20980 Avoid crashing and display error if the process cannot be prepared for JIT mode Dart VM. (cla: yes, platform-ios)

20983 Don’t use GetTaskQueueId() in rasterizer as it breaks Fuchsia (cla: yes, waiting for tree to go green)

20984 fuchsia: Compile disabled RasterThreadMerger code (affects: tests, cla: yes, platform-fuchsia, waiting for tree to go green)

20986 Update test Dart code to pass the latest Dart analyzer rules (cla: yes)

20991 Tweak the mdns error message (cla: yes, platform-ios)

21001 Don’t use GetTaskQueueId() in rasterizer as it breaks Fuchsia (#20983) (cla: yes)