diff --git a/llvm/lib/Transforms/Utils/SampleProfileInference.cpp b/llvm/lib/Transforms/Utils/SampleProfileInference.cpp
--- a/llvm/lib/Transforms/Utils/SampleProfileInference.cpp
+++ b/llvm/lib/Transforms/Utils/SampleProfileInference.cpp
@@ -572,6 +572,9 @@
   std::vector<std::vector<Edge *>> AugmentingEdges;
 };
 
+constexpr int64_t MinCostMaxFlow::AuxCostUnlikely;
+constexpr uint64_t MinCostMaxFlow::MinBaseDistance;
+
 /// A post-processing adjustment of control flow. It applies two steps by
 /// rerouting some flow and making it more realistic:
 ///