Michael Gottesman f79108caf7 [exclusivity] Introduce an env variable to in asserts builds cause the exclusivity part of the runtime to emit logging information. ...

The specific environment variable is SWIFT_DEBUG_RUNTIME_EXCLUSIVITY_LOGGING. We only
check the environment the first time we try to lookup the TLSContext, so it
shouldn't impact exclusivity performance.

My intention is to use this to write some FileCheck tests so that we can really
be sure that the runtime is doing what we think it is. As such I also changed
the small amount of logging routines meant for use in the debugger to use stdout.

2021-07-22 13:25:10 -07:00

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