Make DirectMethodInvocation a subclass of InvocationExpression.

pkg/kernel/lib/ast.dart

Index: pkg/kernel/lib/ast.dart
diff --git a/pkg/kernel/lib/ast.dart b/pkg/kernel/lib/ast.dart
index 71316b5406eeaedbf6e74c5a748bec6f6ae49155..d3a991b3cff4e4d201c04fd094650cae8631f38c 100644
--- a/pkg/kernel/lib/ast.dart
+++ b/pkg/kernel/lib/ast.dart
@@ -1502,7 +1502,7 @@ class DirectPropertySet extends Expression {
 }
 
 /// Directly call an instance method, bypassing ordinary dispatch.
-class DirectMethodInvocation extends Expression {
+class DirectMethodInvocation extends InvocationExpression {
   Expression receiver;
   Procedure target;
   Arguments arguments;
@@ -1512,6 +1512,8 @@ class DirectMethodInvocation extends Expression {
     arguments?.parent = this;
   }
 
+  Name get name => target?.name;
+
   visitChildren(Visitor v) {
     receiver?.accept(v);
     target?.acceptReference(v);