Put #if NDEBUGs back in.

Author: johnno1962

lld/MachO/Driver.cpp

@@ -303,7 +303,7 @@ class SerialBackgroundWorkQueue {
   std::mutex mutex;
 
 public:
-  bool stopAllWork = false;
+  std::atomic_bool stopAllWork = false;
   void queueWork(std::function<void()> work) {
     mutex.lock();
     if (running && queue.empty()) {
@@ -343,21 +343,24 @@ static SerialBackgroundWorkQueue pageInQueue;
 // This code forces the page-ins on multiple threads so
 // the process is not stalled waiting on disk buffer i/o.
 void multiThreadedPageInBackground(DeferredFiles &deferred) {
-  using namespace std::chrono;
   static const size_t pageSize = Process::getPageSizeEstimate();
   static const size_t largeArchive = 10 * 1024 * 1024;
+#ifndef NDEBUG
+  using namespace std::chrono;
   static std::atomic_uint64_t totalBytes = 0;
   std::atomic_int numDeferedFilesAdvised = 0;
   auto t0 = high_resolution_clock::now();
+#endif
 
   auto preloadDeferredFile = [&](const DeferredFile &deferredFile) {
     const StringRef &buff = deferredFile.buffer.getBuffer();
     if (buff.size() > largeArchive)
       return;
 
+#ifndef NDEBUG
     totalBytes += buff.size();
     numDeferedFilesAdvised += 1;
-
+#endif
 #if _WIN32
     // Reference all file's mmap'd pages to load them into memory.
     for (const char *page = buff.data(), *end = page + buff.size();
@@ -373,6 +376,7 @@ void multiThreadedPageInBackground(DeferredFiles &deferred) {
 #undef DEBUG_TYPE
 #endif
   };
+
   { // Create scope for waiting for the taskGroup
     std::atomic_size_t index = 0;
     llvm::parallel::TaskGroup taskGroup;
@@ -387,11 +391,13 @@ void multiThreadedPageInBackground(DeferredFiles &deferred) {
       });
   }
 
+#ifndef NDEBUG
   auto dt = high_resolution_clock::now() - t0;
   if (Process::GetEnv("LLD_MULTI_THREAD_PAGE"))
     llvm::dbgs() << "multiThreadedPageIn " << totalBytes << "/"
                  << numDeferedFilesAdvised << "/" << deferred.size() << "/"
                  << duration_cast<milliseconds>(dt).count() / 1000. << "\n";
+#endif
 }
 
 static void multiThreadedPageIn(const DeferredFiles &deferred) {