[Analysis] Fix a warning

This patch fixes:

  llvm/unittests/Analysis/FunctionPropertiesAnalysisTest.cpp:132:12:
  error: moving a local object in a return statement prevents copy
  elision [-Werror,-Wpessimizing-move]

llvm/unittests/Analysis/FunctionPropertiesAnalysisTest.cpp

@@ -129,7 +129,7 @@ protected:
   std::unique_ptr<ir2vec::Embedder> createEmbedder(const Function &F) {
     auto Emb = ir2vec::Embedder::create(IR2VecKind::Symbolic, F, Vocabulary);
     EXPECT_TRUE(static_cast<bool>(Emb));
-    return std::move(Emb);
+    return Emb;
   }
 };