diff --git a/clang/test/Driver/check-time-trace-sections.py b/clang/test/Driver/check-time-trace-sections.py
old mode 100644
new mode 100755
--- a/clang/test/Driver/check-time-trace-sections.py
+++ b/clang/test/Driver/check-time-trace-sections.py
@@ -13,9 +13,12 @@
 
 log_contents = json.loads(sys.stdin.read())
 events = log_contents["traceEvents"]
-codegens = [event for event in events if event["name"] == "CodeGen Function"]
+
+instants  = [event for event in events if event["name"] == "InstantiateFunction"]
+codegens  = [event for event in events if event["name"] == "CodeGen Function"]
+opts      = [event for event in events if event["name"] == "OptFunction"]
 frontends = [event for event in events if event["name"] == "Frontend"]
-backends = [event for event in events if event["name"] == "Backend"]
+backends  = [event for event in events if event["name"] == "Backend"]
 
 beginning_of_time = log_contents["beginningOfTime"] / 1000000
 seconds_since_epoch = time.time()
@@ -32,3 +35,11 @@
 if not all([all([is_before(frontend, backend) for frontend in frontends])
                         for backend in backends]):
     sys.exit("Not all Frontend section are before all Backend sections!")
+
+# Check that entries for foo exist and are in a demangled form.
+if not any(e for e in instants if "foo<int>" in e["args"]["detail"]):
+    sys.exit("Missing Instantiate entry for foo!")
+if not any(e for e in codegens if "foo<int>" in e["args"]["detail"]):
+    sys.exit("Missing CodeGen entry for foo!")
+if not any(e for e in opts if "foo<int>" in e["args"]["detail"]):
+    sys.exit("Missing Optimize entry for foo!")
diff --git a/llvm/lib/IR/CMakeLists.txt b/llvm/lib/IR/CMakeLists.txt
--- a/llvm/lib/IR/CMakeLists.txt
+++ b/llvm/lib/IR/CMakeLists.txt
@@ -77,6 +77,7 @@
 
   LINK_COMPONENTS
   BinaryFormat
+  Demangle
   Remarks
   Support
   )
diff --git a/llvm/lib/IR/LegacyPassManager.cpp b/llvm/lib/IR/LegacyPassManager.cpp
--- a/llvm/lib/IR/LegacyPassManager.cpp
+++ b/llvm/lib/IR/LegacyPassManager.cpp
@@ -12,6 +12,7 @@
 
 #include "llvm/IR/LegacyPassManager.h"
 #include "llvm/ADT/MapVector.h"
+#include "llvm/Demangle/Demangle.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/LLVMContext.h"
@@ -1408,7 +1409,8 @@
     FunctionSize = F.getInstructionCount();
   }
 
-  llvm::TimeTraceScope FunctionScope("OptFunction", F.getName());
+  llvm::TimeTraceScope FunctionScope(
+      "OptFunction", [&F]() { return demangle(F.getName().str()); });
 
   for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
     FunctionPass *FP = getContainedPass(Index);