[PATCH] [Tsan] Do not sanitize memcpy() during thread initialization on FreeBSD

[Dmitry Vyukov]

================
Comment at: lib/tsan/rtl/tsan_interceptors.cc:673
@@ +672,3 @@
+  // On FreeBSD we get here from libthr internals on thread initialization.
+  if (cur_thread()->shadow_stack_pos != 0) {
+    SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
----------------
please add is_inited flag to ThreadState, similar to is_dead
and set it in ThreadContext::OnStarted
shadow_stack_pos check looks confusing

http://reviews.llvm.org/D8324

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