Minor cleanup in Internalize, hide helper class using anonymous namespace (NFC)

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 266173
diff --git a/llvm/lib/Transforms/IPO/Internalize.cpp b/llvm/lib/Transforms/IPO/Internalize.cpp
index 7765cd5..c01a5e1 100644
--- a/llvm/lib/Transforms/IPO/Internalize.cpp
+++ b/llvm/lib/Transforms/IPO/Internalize.cpp
@@ -117,11 +117,6 @@
     AU.addPreserved<CallGraphWrapperPass>();
   }
 };
-} // end anonymous namespace
-
-char InternalizePass::ID = 0;
-INITIALIZE_PASS(InternalizePass, "internalize", "Internalize Global Symbols",
-                false, false)
 
 // Helper class to perform internalization.
 class Internalizer {
@@ -299,6 +294,12 @@
   return Changed;
 }
 
+} // end anonymous namespace
+
+char InternalizePass::ID = 0;
+INITIALIZE_PASS(InternalizePass, "internalize", "Internalize Global Symbols",
+                false, false)
+
 /// Public API below
 
 bool llvm::internalizeModule(