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6397e30856
Move to a recursive lock inline in the Task. This avoids the need to allocate a lock record and simplifies the code somewhat. Change Task's OpaquePrivateStorage to compute its size at build time based on the sizes of its components, rather than having it be a fixed size. It appears that the fixed size was intended to be part of the ABI, but that didn't happen and we're free to change this size. We need to expand it slightly when using pthread_mutex as the recursive lock, as pthread_mutex is pretty big. Other recursive locks allow it to shrink slightly. We don't have a recursive mutex in our Threading support code, so add a RecursiveMutex type. rdar://113898653