Handle local functions in kernel_impact.

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

Index: pkg/compiler/lib/src/ssa/kernel_impact.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_impact.dart b/pkg/compiler/lib/src/ssa/kernel_impact.dart
index fef8f82a6282ad237893285a679b9207ed255810..f03bd1f61372d7b4ae273ad2d6e43e6eb6ff3e92 100644
--- a/pkg/compiler/lib/src/ssa/kernel_impact.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_impact.dart
@@ -244,10 +244,17 @@ class KernelImpactBuilder extends ir.Visitor {
 
   @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
@@ -280,5 +287,12 @@ class KernelImpactBuilder extends ir.Visitor {
   }
 
   @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);
 }