diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -279,7 +279,6 @@
            "PostDomTree, so don't ask for it.");
   }
 
-  bool simplifyOnce(BasicBlock *BB);
   bool simplifyOnceImpl(BasicBlock *BB);
   bool run(BasicBlock *BB);
 
@@ -6760,12 +6759,6 @@
   return Changed;
 }
 
-bool SimplifyCFGOpt::simplifyOnce(BasicBlock *BB) {
-  bool Changed = simplifyOnceImpl(BB);
-
-  return Changed;
-}
-
 bool SimplifyCFGOpt::run(BasicBlock *BB) {
   bool Changed = false;
 
@@ -6775,7 +6768,7 @@
 
     // Perform one round of simplifcation. Resimplify flag will be set if
     // another iteration is requested.
-    Changed |= simplifyOnce(BB);
+    Changed |= simplifyOnceImpl(BB);
   } while (Resimplify);
 
   return Changed;