Remove MetadataBase class because it is not adding significant value.

llvm-svn: 94243
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.h b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
index c50fe9c..4f8ebf5 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
@@ -127,7 +127,7 @@
 private:
   void OptimizeConstants(unsigned CstStart, unsigned CstEnd);
     
-  void EnumerateMetadata(const MetadataBase *MD);
+  void EnumerateMetadata(const Value *MD);
   void EnumerateNamedMDNode(const NamedMDNode *NMD);
   void EnumerateValue(const Value *V);
   void EnumerateType(const Type *T);