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/Mips/MipsISelDAGToDAG.cpp b/llvm/lib/Target/Mips/MipsISelDAGToDAG.cpp
index cc20dd7..be0feb1 100644
--- a/llvm/lib/Target/Mips/MipsISelDAGToDAG.cpp
+++ b/llvm/lib/Target/Mips/MipsISelDAGToDAG.cpp
@@ -46,7 +46,7 @@
 //===----------------------------------------------------------------------===//
 namespace {
 
-class VISIBILITY_HIDDEN MipsDAGToDAGISel : public SelectionDAGISel {
+class MipsDAGToDAGISel : public SelectionDAGISel {
 
   /// TM - Keep a reference to MipsTargetMachine.
   MipsTargetMachine &TM;