Alex Hoppen 7d5ee83a61 [SourceKit] Allow explicit cancellation of requests with a cancellation token ...

The key changes here are
- To keep track of cancellation tokens for all `ScheduledConsumer`s in `SwiftASTManager`
- Generate unique request handles for all incoming requests (`create_request_handle `), use these request handles as cancellation tokens and return them from the `sourcekitd_send_request` methods
- Implement cancellation with `sourcekitd_cancel_request` as the entry point and `SwiftASTManager::cancelASTConsumer` as the termination point

Everything else is just plumbing the cancellation token through the various abstraction layers.

rdar://83391505

2021-09-30 11:45:24 +02:00

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