Index: llvm/lib/Transforms/Utils/MetaRenamer.cpp
===================================================================
--- llvm/lib/Transforms/Utils/MetaRenamer.cpp
+++ llvm/lib/Transforms/Utils/MetaRenamer.cpp
@@ -26,6 +26,7 @@
 #include "llvm/IR/GlobalAlias.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/Instruction.h"
+#include "llvm/IR/Instructions.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/PassManager.h"
 #include "llvm/IR/Type.h"
@@ -115,7 +116,7 @@
 
     for (auto &I : BB)
       if (!I.getType()->isVoidTy())
-        I.setName("inst");
+        I.setName(isa<PHINode>(I) ? "phi" : "inst");
   }
 }