const runtime.waitReasonSyncMutexLock

5 uses

	runtime (current package)
		mgc.go#L1207: 		waitReasonSyncMutexLock,
		runtime2.go#L1245: 	waitReasonSyncMutexLock                           // "sync.Mutex.Lock"
		runtime2.go#L1295: 	waitReasonSyncMutexLock:         "sync.Mutex.Lock",
		runtime2.go#L1334: 	return w == waitReasonSyncMutexLock ||
		sema.go#L95: 	semacquire1(addr, lifo, semaBlockProfile|semaMutexProfile, skipframes, waitReasonSyncMutexLock)