Build App.framework directly to build directory (#69699)

packages/flutter_tools/lib/src/project.dart

diff --git a/packages/flutter_tools/lib/src/project.dart b/packages/flutter_tools/lib/src/project.dart
index 136fdd2..f32a77a 100644
--- a/packages/flutter_tools/lib/src/project.dart
+++ b/packages/flutter_tools/lib/src/project.dart
@@ -682,7 +682,10 @@
     .childDirectory('Flutter')
     .childFile('Generated.xcconfig');
 
-  Directory get compiledDartFramework => _flutterLibRoot
+  /// No longer compiled to this location.
+  ///
+  /// Used only for "flutter clean" to remove old references.
+  Directory get deprecatedCompiledDartFramework => _flutterLibRoot
       .childDirectory('Flutter')
       .childDirectory('App.framework');