[PrintAsObjC] Reorganize DeclAndTypePrinter fields to make more sense

No functionality change

Author: jrose-apple

lib/PrintAsObjC/DeclAndTypePrinter.cpp

@@ -99,19 +99,20 @@ class DeclAndTypePrinter::Implementation
   friend ASTVisitor;
   friend TypeVisitor;
 
-  using NameAndOptional = std::pair<StringRef, bool>;
-  llvm::DenseMap<std::pair<Identifier, Identifier>, NameAndOptional>
-    specialNames;
-  Identifier ID_CFTypeRef;
-
   ModuleDecl &M;
   raw_ostream &os;
+  const DelayedMemberSet &delayedMembers;
+  AccessLevel minRequiredAccess;
 
   SmallVector<const FunctionType *, 4> openFunctionTypes;
-  const DelayedMemberSet &delayedMembers;
 
+  using NameAndOptional = std::pair<StringRef, bool>;
+  llvm::DenseMap<std::pair<Identifier, Identifier>, NameAndOptional>
+    specialNames;
+
+  // Cached for convenience.
+  Identifier ID_CFTypeRef;
   Optional<Type> NSCopyingType;
-  AccessLevel minRequiredAccess;
 
 public:
   explicit Implementation(ModuleDecl &mod, raw_ostream &out,