[NFC][llvm-exegesis] Try to fix GCC7 build

https://lab.llvm.org/staging/#/builders/235/builds/1121

diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp b/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp
index c0e4c61..673221e 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp
@@ -367,7 +367,7 @@ InstructionBenchmark::readYamls(const LLVMState &State,
       return make_error<Failure>(Context.getLastError());
     Yin.nextDocument();
   }
-  return Benchmarks;
+  return std::move(Benchmarks);
 }
 
 Error InstructionBenchmark::writeYamlTo(const LLVMState &State,