[tools] Add a VMState for Atomics.wait
We will use this state in devtools via the inspector to indicate whether a thread is currently stuck polling in atomics.wait. VMState already distinguishes the important states we care about which are idle vs. running JS. We also want to know the state for atomics.wait(), which is commonly used in WebWorkers to poll the main page for work to do. This CL just adds and maintains the state and adds assertions in atomics tests. Another CL will emit inspector notifications when the VMState changes in a way that the inspector cares about. Re-flow comments as a drive-by cleanup. Bug: chromium:1025490 Change-Id: I961051bfb846aa20454a56214310370ea8e47d1c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2033168 Commit-Queue: Peter Marshall <petermarshall@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#66071}
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