[gardening][lib/Basic][C++11] Replace typedef with using

lib/Basic/Mangler.cpp

@@ -90,8 +90,8 @@ void Mangle::printManglingStats() {
   }
 
   llvm::outs() << "Mangling operator stats:\n";
-  
-  typedef llvm::StringMapEntry<OpStatEntry> MapEntry;
+
+  using MapEntry = llvm::StringMapEntry<OpStatEntry>;
   std::vector<const MapEntry *> SortedOpStats;
   for (const MapEntry &ME : OpStats) {
     SortedOpStats.push_back(&ME);

lib/Basic/Statistic.cpp

@@ -172,9 +172,8 @@ class UnifiedStatsReporter::RecursionSafeTimers {
 class StatsProfiler {
   struct Node {
     int64_t SelfCount;
-    typedef std::tuple<StringRef,
-                       const void*,
-                       const UnifiedStatsReporter::TraceFormatter*> Key;
+    using Key = std::tuple<StringRef, const void *,
+                           const UnifiedStatsReporter::TraceFormatter *>;
     Node *Parent;
     DenseMap<Key, std::unique_ptr<Node>> Children;
 

lib/Basic/StringExtras.cpp

@@ -994,7 +994,7 @@ static bool isVacuousPreposition(StringRef beforePreposition,
 }
 
 namespace {
-  typedef std::reverse_iterator<camel_case::WordIterator> ReverseWordIterator;
+using ReverseWordIterator = std::reverse_iterator<camel_case::WordIterator>;
 } // end anonymous namespace
 
 /// Find the last preposition in the given word.

lib/Basic/TaskQueue.cpp

@@ -51,7 +51,7 @@ void DummyTaskQueue::addTask(const char *ExecPath, ArrayRef<const char *> Args,
 bool DummyTaskQueue::execute(TaskQueue::TaskBeganCallback Began,
                              TaskQueue::TaskFinishedCallback Finished,
                              TaskQueue::TaskSignalledCallback Signalled) {
-  typedef std::pair<ProcessId, std::unique_ptr<DummyTask>> PidTaskPair;
+  using PidTaskPair = std::pair<ProcessId, std::unique_ptr<DummyTask>>;
   std::queue<PidTaskPair> ExecutingTasks;
 
   bool SubtaskFailed = false;

lib/Basic/Unix/TaskQueue.inc

@@ -308,7 +308,7 @@ void TaskQueue::addTask(const char *ExecPath, ArrayRef<const char *> Args,
 
 bool TaskQueue::execute(TaskBeganCallback Began, TaskFinishedCallback Finished,
                         TaskSignalledCallback Signalled) {
-  typedef llvm::DenseMap<pid_t, std::unique_ptr<Task>> PidToTaskMap;
+  using PidToTaskMap = llvm::DenseMap<pid_t, std::unique_ptr<Task>>;
 
   // Stores the current executing Tasks, organized by pid.
   PidToTaskMap ExecutingTasks;