--- x86_64-linux-gnu-clang-3.6.orig/llvm/include/llvm/IR/ValueMap.h	2019-08-21 11:38:34.282434856 -0700
+++ x86_64-linux-gnu-clang-3.6/llvm/include/llvm/IR/ValueMap.h	2019-08-21 11:33:41.327987115 -0700
@@ -101,7 +101,7 @@
 
   ~ValueMap() {}
 
-  bool hasMD() const { return MDMap; }
+  bool hasMD() const { return static_cast<bool>(MDMap); }
   MDMapT &MD() {
     if (!MDMap)
       MDMap.reset(new MDMapT);