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
diff --git a/llvm/lib/Target/Alpha/AlphaCodeEmitter.cpp b/llvm/lib/Target/Alpha/AlphaCodeEmitter.cpp
index 8023add..ea828c8 100644
--- a/llvm/lib/Target/Alpha/AlphaCodeEmitter.cpp
+++ b/llvm/lib/Target/Alpha/AlphaCodeEmitter.cpp
@@ -50,8 +50,7 @@
   };
 
   template <class CodeEmitter>
-  class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass,
-      public AlphaCodeEmitter
+  class Emitter : public MachineFunctionPass, public AlphaCodeEmitter
   {
     const AlphaInstrInfo  *II;
     TargetMachine         &TM;