[vm/slots] Use atomics for native slots. This is to ensure that there are no data races when intitializing and accessing native slots. Fixes https://github.com/dart-lang/sdk/issues/44368 TEST=build dart on mac with tsan Change-Id: I311ae050a84b2d832799f5116d56b835e3d48f38 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174841 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>
Dart is:
Optimized for UI: Develop with a programming language specialized around the needs of user interface creation
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Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
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