Mike Ash comments

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                                            Mike Ash

[Runtime] Add tracing for section scans.

@swift-ci please test

[Runtime] Add tracing for section scans.

@swift-ci please smoke test

[Runtime] Add tracing for section scans.

I keep forgetting to look at the failures until after they expire.

[Runtime] Add tracing for section scans.

@swift-ci please smoke test

[Runtime] Add tracing for section scans.

Finally got it: ``` [ RUN ] BackwardDeployProtocol.ConditionalConformance stderr>>> CRASHED: SIGSEGV the test crashed unexpectedly [ FAIL ] BackwardDeployProtocol.ConditionalConformance ``` We must not be tolerating NULL somewhere we need to.

[Runtime] Add tracing for section scans.

@swift-ci please test and merge

[Runtime] Add tracing for section scans.

@swift-ci please test and merge

Reading from Serial Ports

I would suspect the same, unless serial ports need some sort of special handling that I don't know about. Do serial port file descriptors work correctly with select or kqueue?

Reading from Serial Ports

It would be interesting to test it with kqueue as well, as that's what GCD uses internally to implement dispatch sources. If it works with kqueue but not GCD, then...

[6.0][Runtime] Avoid dlsym of objc_isUniquelyReferenced.

Explanation: We want to directly reference `objc_isUniquelyReferenced` when it's available in the SDK, and look it up with `dlsym` when it isn't. The previous attempt to do that didn't quite...