[ThinLTO] Add TimeTrace for Thinlink step

Results from Clang self-build:

{F17435948}

Testing:
ninja check-all

Reviewed By: anton-afanasyev

Differential Revision: https://reviews.llvm.org/D104428

llvm/lib/LTO/LTO.cpp

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/LTO/LTO.h"
+#include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringExtras.h"
@@ -1398,6 +1399,11 @@ ThinBackend lto::createWriteIndexesThinBackend(
 
 Error LTO::runThinLTO(AddStreamFn AddStream, NativeObjectCache Cache,
                       const DenseSet<GlobalValue::GUID> &GUIDPreservedSymbols) {
+  timeTraceProfilerBegin("ThinLink", StringRef(""));
+  auto TimeTraceScopeExit = llvm::make_scope_exit([]() {
+    if (llvm::timeTraceProfilerEnabled())
+      llvm::timeTraceProfilerEnd();
+  });
   if (ThinLTO.ModuleMap.empty())
     return Error::success();
 
@@ -1512,6 +1518,11 @@ Error LTO::runThinLTO(AddStreamFn AddStream, NativeObjectCache Cache,
 
   generateParamAccessSummary(ThinLTO.CombinedIndex);
 
+  if (llvm::timeTraceProfilerEnabled())
+    llvm::timeTraceProfilerEnd();
+
+  TimeTraceScopeExit.release();
+
   std::unique_ptr<ThinBackendProc> BackendProc =
       ThinLTO.Backend(Conf, ThinLTO.CombinedIndex, ModuleToDefinedGVSummaries,
                       AddStream, Cache);

llvm/lib/LTO/ThinLTOCodeGenerator.cpp

@@ -14,6 +14,7 @@
 #include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
 #include "llvm/Support/CommandLine.h"
 
+#include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Analysis/AliasAnalysis.h"
@@ -996,6 +997,11 @@ ThinLTOCodeGenerator::writeGeneratedObject(int count, StringRef CacheEntryPath,
 
 // Main entry point for the ThinLTO processing
 void ThinLTOCodeGenerator::run() {
+  timeTraceProfilerBegin("ThinLink", StringRef(""));
+  auto TimeTraceScopeExit = llvm::make_scope_exit([]() {
+    if (llvm::timeTraceProfilerEnabled())
+      llvm::timeTraceProfilerEnd();
+  });
   // Prepare the resulting object vector
   assert(ProducedBinaries.empty() && "The generator should not be reused");
   if (SavedObjectsDirectoryPath.empty())
@@ -1141,6 +1147,11 @@ void ThinLTOCodeGenerator::run() {
     ModulesVec.push_back(&Mod->getSingleBitcodeModule());
   std::vector<int> ModulesOrdering = lto::generateModulesOrdering(ModulesVec);
 
+  if (llvm::timeTraceProfilerEnabled())
+    llvm::timeTraceProfilerEnd();
+
+  TimeTraceScopeExit.release();
+
   // Parallel optimizer + codegen
   {
     ThreadPool Pool(heavyweight_hardware_concurrency(ThreadCount));