aaea32bae7
This patch allows us to start and stop the execution tracer from a native endpoint rather than through the debugger object, and allows us to read the trace into a native struct rather than a JS object. Giving a thread safe native endpoint makes integration very easy for the profiler, and is also more efficient than writing to and reading from an intermediary JS object. Differential Revision: https://phabricator.services.mozilla.com/D221102
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