Dimitry Andric:  many visibility fixes.  Howard:  Much appreciated.  Can you send me a patch to CREDITS.TXT?

llvm-svn: 163862
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: aeb85680fb688e96ba2d2fc7703ae6e57cc44097
diff --git a/include/thread b/include/thread
index 94e7ab6..60d8885 100644
--- a/include/thread
+++ b/include/thread
@@ -173,13 +173,13 @@
     delete __p_old;
 }
 
-class thread;
-class __thread_id;
+class _LIBCPP_VISIBLE thread;
+class _LIBCPP_VISIBLE __thread_id;
 
 namespace this_thread
 {
 
-__thread_id get_id() _NOEXCEPT;
+_LIBCPP_INLINE_VISIBILITY __thread_id get_id() _NOEXCEPT;
 
 }  // this_thread