AST: Remove ExtensionDecl::alreadyBoundToNominal()

Author: slavapestov

include/swift/AST/Decl.h

@@ -1416,10 +1416,6 @@ class ExtensionDecl final : public GenericContext, public Decl,
 
   bool hasValidParent() const;
 
-  /// Determine whether this extension has already been bound to a nominal
-  /// type declaration.
-  bool alreadyBoundToNominal() const { return NextExtension.getInt(); }
-
   /// Retrieve the extended type definition as written in the source, if it exists.
   ///
   /// Repr would not be available if the extension was been loaded

lib/AST/Decl.cpp

@@ -4384,7 +4384,7 @@ ExtensionRange NominalTypeDecl::getExtensions() {
 }
 
 void NominalTypeDecl::addExtension(ExtensionDecl *extension) {
-  assert(!extension->alreadyBoundToNominal() && "Already added extension");
+  assert(!extension->NextExtension.getInt() && "Already added extension");
   extension->NextExtension.setInt(true);
 
   // First extension; set both first and last.

lib/Sema/TypeChecker.cpp

@@ -183,23 +183,14 @@ ModuleDecl *TypeChecker::getStdlibModule(const DeclContext *dc) {
   return dc->getParentModule();
 }
 
-/// Bind the given extension to the given nominal type.
-static void bindExtensionToNominal(ExtensionDecl *ext,
-                                   NominalTypeDecl *nominal) {
-  if (ext->alreadyBoundToNominal())
-    return;
-
-  nominal->addExtension(ext);
-}
-
 void swift::bindExtensions(ModuleDecl &mod) {
   // Utility function to try and resolve the extended type without diagnosing.
   // If we succeed, we go ahead and bind the extension. Otherwise, return false.
   auto tryBindExtension = [&](ExtensionDecl *ext) -> bool {
     assert(!ext->canNeverBeBound() &&
            "Only extensions that can ever be bound get here.");
     if (auto nominal = ext->computeExtendedNominal()) {
-      bindExtensionToNominal(ext, nominal);
+      nominal->addExtension(ext);
       return true;
     }