Mike Ash 0977920217 [Concurrency] Add tracing for major operations in the concurrency runtime. ...

Each trace point is declared as a function in the new `Tracing.h` header. These functions are called from the appropriate places in the concurrency runtime.

On Darwin, an implementation of these functions is provided which uses the `os/signpost.h` API to emit signpost events/intervals.

When the signpost API is not available, no-op stub implementations are provided. Implementations for other OSes can be provided by providing implementations of the trace functions for that OS.

rdar://81858487

2022-01-07 11:35:40 -05:00

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