Strip TypeChecker of some friends

CodaFi · CodaFi · commit d5861998563b · 2019-11-13T10:04:23.000-08:00
TypeChecker has no friends.
diff --git a/lib/Sema/TypeChecker.h b/lib/Sema/TypeChecker.h
@@ -546,8 +546,6 @@ class TypeChecker final {
   ~TypeChecker() = default;
 
   friend class ASTContext;
-  friend class constraints::ConstraintSystem;
-  friend class TypeCheckFunctionBodyUntilRequest;
 
 public:
   /// Create a new type checker instance for the given ASTContext, if it
