Index: llvm/lib/IR/LegacyPassManager.cpp
===================================================================
--- llvm/lib/IR/LegacyPassManager.cpp
+++ llvm/lib/IR/LegacyPassManager.cpp
@@ -32,6 +32,7 @@
 #include "llvm/Support/TimeProfiler.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Demangle/Demangle.h"
 #include <algorithm>
 #include <unordered_set>
 using namespace llvm;
@@ -1417,7 +1418,7 @@
     FunctionSize = F.getInstructionCount();
   }
 
-  llvm::TimeTraceScope FunctionScope("OptFunction", F.getName());
+  llvm::TimeTraceScope FunctionScope("OptFunction", StringRef(demangle(F.getName().str())));
 
   for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
     FunctionPass *FP = getContainedPass(Index);