remove declaration of _objc_empty_vtable no longer

used in modern objc translator. // rdar://11105680



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153386 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Rewrite/RewriteModernObjC.cpp

@@ -5421,7 +5421,6 @@ static void WriteModernMetadataDeclarations(ASTContext *Context, std::string &Re
   Result += "};\n";
   
   Result += "__declspec(dllimport) extern struct objc_cache _objc_empty_cache;\n";
-  Result += "extern void *_objc_empty_vtable;\n";
   
   meta_data_declared = true;
 }