[TSan] FreeBSD / intercept thr_exit

[devnexen]

Summary

intercepting thr_exit to terminate threads under FreeBSD.
Unblock few unit tests hanging.

lib/tsan/rtl/tsan_interceptors.cc

TSAN_INTERCEPTOR(void, _lwp_exit) {
   DestroyThreadState();
   REAL(_lwp_exit)();
 }
 #define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)
 #else
 #define TSAN_MAYBE_INTERCEPT__LWP_EXIT
 #endif
 
+#if SANITIZER_FREEBSD
+TSAN_INTERCEPTOR(void, thr_exit, tid_t *state) {
+  SCOPED_TSAN_INTERCEPTOR(thr_exit, state);
+  DestroyThreadState();
+  REAL(thr_exit(state));
+}
+#define TSAN_MAYBE_INTERCEPT_THR_EXIT TSAN_INTERCEPT(thr_exit)
+#else
+#define TSAN_MAYBE_INTERCEPT_THR_EXIT
+#endif
+
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_init, void *c, void *a);
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_signal, void *c);
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_broadcast, void *c);
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_wait, void *c, void *m);
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_destroy, void *c);
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_init, void *m, void *a);
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_destroy, void *m);
 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_trylock, void *m);
#endif
   TSAN_INTERCEPT(__cxa_atexit);
   TSAN_INTERCEPT(_exit);
 
 #ifdef NEED_TLS_GET_ADDR
   TSAN_INTERCEPT(__tls_get_addr);
 #endif
 
   TSAN_MAYBE_INTERCEPT__LWP_EXIT;
+  TSAN_MAYBE_INTERCEPT_THR_EXIT;
 
 #if !SANITIZER_MAC && !SANITIZER_ANDROID
   // Need to setup it, because interceptors check that the function is resolved.
   // But atexit is emitted directly into the module, so can't be resolved.
   REAL(atexit) = (int(*)(void(*)()))unreachable;
 #endif
 
   if (REAL(__cxa_atexit)(&finalize, 0, 0)) {