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/Analysis/InstCount.cpp

@@ -34,8 +34,7 @@ STATISTIC(TotalMemInst, "Number of memory instructions");
 
 
 namespace {
-  class VISIBILITY_HIDDEN InstCount 
-      : public FunctionPass, public InstVisitor<InstCount> {
+  class InstCount : public FunctionPass, public InstVisitor<InstCount> {
     friend class InstVisitor<InstCount>;
 
     void visitFunction  (Function &F) { ++TotalFuncs; }