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.

llvm-svn: 85042

llvm/lib/CodeGen/ShadowStackGC.cpp

@@ -38,7 +38,7 @@ using namespace llvm;
 
 namespace {
 
-  class VISIBILITY_HIDDEN ShadowStackGC : public GCStrategy {
+  class ShadowStackGC : public GCStrategy {
     /// RootChain - This is the global linked-list that contains the chain of GC
     /// roots.
     GlobalVariable *Head;
@@ -84,7 +84,7 @@ namespace {
   ///
   /// It's wrapped up in a state machine using the same transform C# uses for
   /// 'yield return' enumerators, This transform allows it to be non-allocating.
-  class VISIBILITY_HIDDEN EscapeEnumerator {
+  class EscapeEnumerator {
     Function &F;
     const char *CleanupBBName;