[llvm-exegesis][NFC] Fix a few warnings.

llvm-svn: 329174
diff --git a/llvm/tools/llvm-exegesis/lib/Latency.cpp b/llvm/tools/llvm-exegesis/lib/Latency.cpp
index b28b81c..770b928 100644
--- a/llvm/tools/llvm-exegesis/lib/Latency.cpp
+++ b/llvm/tools/llvm-exegesis/lib/Latency.cpp
@@ -89,7 +89,7 @@
     if (Value < MinLatency)
       MinLatency = Value;
   }
-  return {{"latency", static_cast<double>(MinLatency) / NumRepetitions}};
+  return {{"latency", static_cast<double>(MinLatency) / NumRepetitions, ""}};
 }
 
 } // namespace exegesis