Merge pull request swiftlang#14632 from rxwei/master

[Sema] NFC: delete TypeChecker's copy constructor

Author: rudkx

lib/Sema/TypeChecker.h

@@ -910,6 +910,8 @@ class TypeChecker final : public LazyResolver {
 public:
   TypeChecker(ASTContext &Ctx) : TypeChecker(Ctx, Ctx.Diags) { }
   TypeChecker(ASTContext &Ctx, DiagnosticEngine &Diags);
+  TypeChecker(const TypeChecker&) = delete;
+  TypeChecker& operator=(const TypeChecker&) = delete;
   ~TypeChecker();
 
   LangOptions &getLangOpts() const { return Context.LangOpts; }