[compiler-rt] [RTSan][Darwin] Adjust OSSpinLock/_os_nospin_lock interceptor and tests (PR #132867)

[via llvm-commits]

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@@ -1113,6 +1113,14 @@ TEST(TestRtsanInterceptors, PthreadJoinDiesWhenRealtime) {
 #pragma clang diagnostic push
 // OSSpinLockLock is deprecated, but still in use in libc++
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#undef OSSpinLockLock
+extern "C" {
+typedef int32_t OSSpinLock;
+void OSSpinLockLock(volatile OSSpinLock *__lock);
+typedef volatile OSSpinLock *_os_nospin_lock_t;
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davidtrevelyan wrote:

All good - that makes sense - thanks for the info. Would you mind adding this context as a comment into the code at the points where the `typedef` is made (here and in `rtsan_interceptors_posix.cpp`)? I'd be happy to add the context comments myself, but I would want to get your approval on the wording before merging. Let me know - then I think this PR should be good to go in 👍 

https://github.com/llvm/llvm-project/pull/132867