[ORC] Fix the unit tests that were broken by r343323.

llvm-svn: 343326
diff --git a/llvm/unittests/ExecutionEngine/Orc/OrcTestCommon.h b/llvm/unittests/ExecutionEngine/Orc/OrcTestCommon.h
index 23ca74c..c9a4305 100644
--- a/llvm/unittests/ExecutionEngine/Orc/OrcTestCommon.h
+++ b/llvm/unittests/ExecutionEngine/Orc/OrcTestCommon.h
@@ -106,6 +106,8 @@
       Destructor();
   }
 
+  StringRef getName() const override { return "<Simple>"; }
+
   void materialize(orc::MaterializationResponsibility R) override {
     Materialize(std::move(R));
   }