Handle local functions in kernel_impact.

pkg/compiler/lib/src/ssa/kernel_impact.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart';
 import '../compiler.dart';
 import '../constants/expressions.dart';
@@ skipping 226 matching lines @@
   }
 
   @override
   void visitStaticGet(ir.StaticGet node) {
     Element target = astAdapter.getElement(node.target).declaration;
     impactBuilder.registerStaticUse(new StaticUse.staticGet(target));
   }
 
   @override
   void visitMethodInvocation(ir.MethodInvocation invocation) {
-    invocation.receiver.accept(this);
+    var receiver = invocation.receiver;
+    if (receiver is ir.VariableGet &&
+        receiver.variable.isFinal &&
+        receiver.variable.parent is ir.FunctionDeclaration) {
+      // Invocation of a local function. No need for dynamic use.
+    } else {
+      invocation.receiver.accept(this);
+      impactBuilder.registerDynamicUse(
+          new DynamicUse(astAdapter.getSelector(invocation), null));
+    }
     _visitArguments(invocation.arguments);
-    impactBuilder.registerDynamicUse(
-        new DynamicUse(astAdapter.getSelector(invocation), null));
   }
 
   @override
   void visitPropertyGet(ir.PropertyGet node) {
     node.receiver.accept(this);
     impactBuilder.registerDynamicUse(new DynamicUse(
         new Selector.getter(astAdapter.getName(node.name)), null));
   }
 
   @override
@@ skipping 12 matching lines @@
   }
 
   @override
   void visitStringConcatenation(ir.StringConcatenation node) {
     impactBuilder.registerFeature(Feature.STRING_INTERPOLATION);
     impactBuilder.registerFeature(Feature.STRING_JUXTAPOSITION);
     node.visitChildren(this);
   }
 
   @override
+  void visitFunctionDeclaration(ir.FunctionDeclaration node) {
+    impactBuilder
+        .registerStaticUse(new StaticUse.closure(astAdapter.getElement(node)));
+    node.visitChildren(this);
+  }
+
+  @override
   void defaultNode(ir.Node node) => node.visitChildren(this);
 }