Remove MetadataBase class because it is not adding significant value.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94243 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Linker/LinkModules.cpp b/lib/Linker/LinkModules.cpp
index dcd696c..e2cd47a 100644
--- a/lib/Linker/LinkModules.cpp
+++ b/lib/Linker/LinkModules.cpp
@@ -392,7 +392,7 @@
       assert(!isa<GlobalValue>(CPV) && "Unmapped global?");
       llvm_unreachable("Unknown type of derived type constant value!");
     }
-  } else if (isa<MetadataBase>(In)) {
+  } else if (isa<MDNode>(In) ||  isa<MDString>(In)) {
     Result = const_cast<Value*>(In);
   } else if (isa<InlineAsm>(In)) {
     Result = const_cast<Value*>(In);