On Mac OS X, the presence of an 'availability' attribute for that

platform implies default visibility. To achieve these, refactor our
lookup of explicit visibility so that we search for both an explicit
VisibilityAttr and an appropriate AvailabilityAttr, favoring the
VisibilityAttr if it is present.

llvm-svn: 128336

clang/lib/CodeGen/CodeGenModule.cpp

@@ -224,7 +224,7 @@ void CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV,
     return;
 
   // Don't override an explicit visibility attribute.
-  if (RD->hasAttr<VisibilityAttr>())
+  if (RD->getExplicitVisibility())
     return;
 
   switch (RD->getTemplateSpecializationKind()) {