Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h
+++ include/clang/Sema/Sema.h
@@ -54,6 +54,7 @@
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/TinyPtrVector.h"
+#include "llvm/Support/Timer.h"
 #include <deque>
 #include <memory>
 #include <string>
@@ -279,6 +280,8 @@
 
   static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);
 
+  llvm::RefCntTimer TemplateInstantiationTime;
+
   bool isVisibleSlow(const NamedDecl *D);
 
   bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
Index: lib/Sema/Sema.cpp
===================================================================
--- lib/Sema/Sema.cpp
+++ lib/Sema/Sema.cpp
@@ -116,6 +116,7 @@
 Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
            TranslationUnitKind TUKind, CodeCompleteConsumer *CodeCompleter)
     : ExternalSource(nullptr), isMultiplexExternalSource(false),
+      TemplateInstantiationTime("templateinst", "Template Instantiation Time"),
       FPFeatures(pp.getLangOpts()), LangOpts(pp.getLangOpts()), PP(pp),
       Context(ctxt), Consumer(consumer), Diags(PP.getDiagnostics()),
       SourceMgr(PP.getSourceManager()), CollectStats(false),
Index: lib/Sema/SemaTemplateInstantiate.cpp
===================================================================
--- lib/Sema/SemaTemplateInstantiate.cpp
+++ lib/Sema/SemaTemplateInstantiate.cpp
@@ -1992,6 +1992,9 @@
                        const MultiLevelTemplateArgumentList &TemplateArgs,
                        TemplateSpecializationKind TSK,
                        bool Complain) {
+  llvm::TimeRegion Region(
+      llvm::TimePassesIsEnabled ? &TemplateInstantiationTime : nullptr);
+
   CXXRecordDecl *PatternDef
     = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
   if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation,
Index: lib/Sema/SemaTemplateInstantiateDecl.cpp
===================================================================
--- lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -3752,6 +3752,9 @@
                                          bool Recursive,
                                          bool DefinitionRequired,
                                          bool AtEndOfTU) {
+  llvm::TimeRegion Region(
+            llvm::TimePassesIsEnabled ? &TemplateInstantiationTime : nullptr);
+
   if (Function->isInvalidDecl() || Function->isDefined())
     return;