Imported Upstream version 6.10.0.49

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.. title:: clang-tidy - objc-avoid-spinlock
objc-avoid-spinlock
===================
Finds usages of ``OSSpinlock``, which is deprecated due to potential livelock
problems.
This check will detect following function invocations:
- ``OSSpinlockLock``
- ``OSSpinlockTry``
- ``OSSpinlockUnlock``
The corresponding information about the problem of ``OSSpinlock``: https://blog.postmates.com/why-spinlocks-are-bad-on-ios-b69fc5221058