IR/MetadataTest.cpp: Appease msc17 to avoid initializer list.

llvm-svn: 225775
diff --git a/llvm/unittests/IR/MetadataTest.cpp b/llvm/unittests/IR/MetadataTest.cpp
index d07199c..9f5d133 100644
--- a/llvm/unittests/IR/MetadataTest.cpp
+++ b/llvm/unittests/IR/MetadataTest.cpp
@@ -370,7 +370,7 @@
   std::unique_ptr<MDNodeFwdDecl> Temp(MDNodeFwdDecl::get(Context, None));
   Metadata *Ops[] = {nullptr, Temp.get()};
 
-  MDNode *Empty = MDTuple::get(Context, {});
+  MDNode *Empty = MDTuple::get(Context, ArrayRef<Metadata *>());
   MDNode *N = MDTuple::get(Context, Ops);
   EXPECT_EQ(nullptr, N->getOperand(0));
   ASSERT_FALSE(N->isResolved());