Index: llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
+++ llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
@@ -238,13 +238,8 @@
 public:
   static char ID;
 
-  StructurizeCFG() :
-    RegionPass(ID), SkipUniformRegions(false) {
-    initializeStructurizeCFGPass(*PassRegistry::getPassRegistry());
-  }
-
-  StructurizeCFG(bool SkipUniformRegions) :
-    RegionPass(ID), SkipUniformRegions(SkipUniformRegions) {
+  explicit StructurizeCFG(bool SkipUniformRegions = false)
+      : RegionPass(ID), SkipUniformRegions(SkipUniformRegions) {
     initializeStructurizeCFGPass(*PassRegistry::getPassRegistry());
   }