Merge pull request #15473 from ikesyo/frontend-using-over-typedef

[gardening][Frontend] Replace `typedef` with `using`

Author: ikesyo

include/swift/Frontend/OutputFileMap.h

@@ -28,7 +28,7 @@
 
 namespace swift {
 
-typedef llvm::DenseMap<file_types::ID, std::string> TypeToPathMap;
+using TypeToPathMap = llvm::DenseMap<file_types::ID, std::string>;
 
 class OutputFileMap {
 private:

lib/Frontend/OutputFileMap.cpp

@@ -65,7 +65,7 @@ OutputFileMap::getOrCreateOutputMapForSingleOutput() {
 }
 
 void OutputFileMap::dump(llvm::raw_ostream &os, bool Sort) const {
-  typedef std::pair<file_types::ID, std::string> TypePathPair;
+  using TypePathPair = std::pair<file_types::ID, std::string>;
 
   auto printOutputPair = [&os](StringRef InputPath,
                                const TypePathPair &OutputPair) -> void {
@@ -74,7 +74,7 @@ void OutputFileMap::dump(llvm::raw_ostream &os, bool Sort) const {
   };
 
   if (Sort) {
-    typedef std::pair<StringRef, TypeToPathMap> PathMapPair;
+    using PathMapPair = std::pair<StringRef, TypeToPathMap>;
     std::vector<PathMapPair> Maps;
     for (auto &InputPair : InputToOutputsMap) {
       Maps.emplace_back(InputPair.first(), InputPair.second);

lib/Frontend/SerializedDiagnosticConsumer.cpp

@@ -83,8 +83,8 @@ class AbbreviationMap {
   }
 };
 
-typedef SmallVector<uint64_t, 64> RecordData;
-typedef SmallVectorImpl<uint64_t> RecordDataImpl;
+using RecordData = SmallVector<uint64_t, 64>;
+using RecordDataImpl = SmallVectorImpl<uint64_t>;
 
 struct SharedState : llvm::RefCountedBase<SharedState> {
   SharedState(StringRef serializedDiagnosticsPath)
@@ -113,8 +113,8 @@ struct SharedState : llvm::RefCountedBase<SharedState> {
   /// \brief The collection of files used.
   llvm::DenseMap<const char *, unsigned> Files;
 
-  typedef llvm::DenseMap<const void *, std::pair<unsigned, StringRef> >
-  DiagFlagsTy;
+  using DiagFlagsTy =
+      llvm::DenseMap<const void *, std::pair<unsigned, StringRef>>;
 
   /// \brief Map for uniquing strings.
   DiagFlagsTy DiagFlags;
@@ -560,4 +560,3 @@ void SerializedDiagnosticConsumer::handleDiagnostic(
   if (bracketDiagnostic)
     exitDiagBlock();
 }
-