util: Added tsan annotate for thread name.

This allows us to see the name of the thread in tsan
warning reports such as this:

  Thread T7 'CPU 1/TCG' (tid=24317, running) created by main thread at:
Signed-off-by: NRobert Foley <robert.foley@linaro.org>
Reviewed-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
Message-Id: <20200609200738.445-12-robert.foley@linaro.org>
Message-Id: <20200612190237.30436-15-alex.bennee@linaro.org>

util/qemu-thread-posix.c

@@ -15,6 +15,7 @@
 #include "qemu/atomic.h"
 #include "qemu/notify.h"
 #include "qemu-thread-common.h"
+#include "qemu/tsan.h"
 
 static bool name_threads;
 
@@ -513,6 +514,7 @@ static void *qemu_thread_start(void *args)
 # endif
     }
 #endif
+    QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name);
     g_free(qemu_thread_args->name);
     g_free(qemu_thread_args);
     pthread_cleanup_push(qemu_thread_atexit_notify, NULL);