Merge pull request #15616 from ikesyo/parse-using-over-typedef

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

Author: ikesyo

include/swift/Parse/Parser.h

@@ -715,7 +715,7 @@ class Parser {
   };
 
   /// Options that control the parsing of declarations.
-  typedef OptionSet<ParseDeclFlags> ParseDeclOptions;
+  using ParseDeclOptions = OptionSet<ParseDeclFlags>;
 
   void delayParseFromBeginningToHere(ParserPosition BeginParserPosition,
                                      ParseDeclOptions Flags);

include/swift/Parse/PersistentParserState.h

@@ -104,14 +104,14 @@ class PersistentParserState {
   bool PerformConditionEvaluation = true;
 private:
   ScopeInfo ScopeInfo;
-  typedef llvm::DenseMap<AbstractFunctionDecl *,
-                         std::unique_ptr<FunctionBodyState>>
-      DelayedFunctionBodiesTy;
+  using DelayedFunctionBodiesTy =
+      llvm::DenseMap<AbstractFunctionDecl *,
+                     std::unique_ptr<FunctionBodyState>>;
   DelayedFunctionBodiesTy DelayedFunctionBodies;
 
-  typedef llvm::DenseMap<AbstractFunctionDecl *,
-                         std::unique_ptr<AccessorBodyState>>
-      DelayedAccessorBodiesTy;
+  using DelayedAccessorBodiesTy =
+      llvm::DenseMap<AbstractFunctionDecl *,
+                     std::unique_ptr<AccessorBodyState>>;
   DelayedAccessorBodiesTy DelayedAccessorBodies;
 
   /// \brief Parser sets this if it stopped parsing before the buffer ended.

include/swift/Parse/Scope.h

@@ -33,11 +33,11 @@ namespace swift {
 class ScopeInfo {
   friend class Scope;
 public:
-  typedef std::pair<unsigned, ValueDecl*> ValueScopeEntry;
-  
-  typedef TreeScopedHashTable<DeclName, ValueScopeEntry> ScopedHTTy;
-  typedef ScopedHTTy::ScopeTy ScopedHTScopeTy;
-  typedef ScopedHTTy::DetachedScopeTy ScopedHTDetachedScopeTy;
+  using ValueScopeEntry = std::pair<unsigned, ValueDecl *>;
+
+  using ScopedHTTy = TreeScopedHashTable<DeclName, ValueScopeEntry>;
+  using ScopedHTScopeTy = ScopedHTTy::ScopeTy;
+  using ScopedHTDetachedScopeTy = ScopedHTTy::DetachedScopeTy;
 
 private:
   ScopedHTTy HT;