Adds the JavaScript type SharedArrayBuffer gated behind COOP/COEP. The concept of a SharedArrayBuffer is that a message to a worker, is posted but instead of copying the content of the array just a reference to it is shared. The Atomic API provides atomic loads and stores and Read/Modify/Write accesses to SharedArrayBuffers. The Atomic.wait provides the ability for a worker to wait for another worker to signal it, without having to spinlock.
Docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer