Remove Enqueuer argument from Backend.registerStaticUse

pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart

Index: pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
diff --git a/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart b/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
index d729e561fa7049fb07d27db4c80701d2dd0b8fe0..c6e204d7766aabe037e4e49d6ae75efcc9a8b88e 100644
--- a/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
+++ b/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
@@ -128,9 +128,10 @@ class LookupMapAnalysis {
 
   LookupMapAnalysis(this.backend, this.reporter);
 
-  void onQueueEmpty(Enqueuer enqueuer) {
-    if (enqueuer.isResolutionQueue) return;
-    enqueuer.applyImpact(null, impactBuilder.flush());
+  /// Compute the [WorldImpact] for the constants registered since last flush.
+  WorldImpact flush({bool forResolution}) {
+    if (forResolution) return const WorldImpact();
+    return impactBuilder.flush();
   }
 
   /// Whether this analysis and optimization is enabled.