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/exception b/include/exception
index 2f527d9..5b75fb0 100644
--- a/include/exception
+++ b/include/exception
@@ -116,7 +116,7 @@
 
 _LIBCPP_VISIBLE bool uncaught_exception() _NOEXCEPT;
 
-class exception_ptr;
+class _LIBCPP_VISIBLE exception_ptr;
 
 exception_ptr current_exception() _NOEXCEPT;
 _LIBCPP_NORETURN void rethrow_exception(exception_ptr);