Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces.

Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85042 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/OcamlGC.cpp

@@ -21,7 +21,7 @@
 using namespace llvm;
 
 namespace {
-  class VISIBILITY_HIDDEN OcamlGC : public GCStrategy {
+  class OcamlGC : public GCStrategy {
   public:
     OcamlGC();
   };