Support patched generic methods.

pkg/compiler/lib/src/elements/elements.dart

Index: pkg/compiler/lib/src/elements/elements.dart
diff --git a/pkg/compiler/lib/src/elements/elements.dart b/pkg/compiler/lib/src/elements/elements.dart
index 178ba0317e436098cc2a041ec974dcdf63cfe8f9..66eec37b0622ea31246e1db97a60f26a3c1b5b98 100644
--- a/pkg/compiler/lib/src/elements/elements.dart
+++ b/pkg/compiler/lib/src/elements/elements.dart
@@ -1417,6 +1417,14 @@ abstract class ConstructorBodyElement extends MethodElement {
 /// [GenericElement] defines the common interface for generic functions and
 /// [TypeDeclarationElement].
 abstract class GenericElement extends Element implements AstElement {
+  /// Do not use [computeType] outside of the resolver.
+  ///
+  /// Trying to access a type that has not been computed in resolution is an
+  /// error and calling [computeType] covers that error.
+  /// This method will go away!
+  @deprecated
+  DartType computeType(Resolution resolution);
+
   /**
    * The type variables declared on this declaration. The type variables are not
    * available until the type of the element has been computed through