Compute WorldImpact for mirror analysis.

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

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index 56e8e89180a74eefc363f6a85d257a814843aa66..2ceba371fa644eb30f1208c3d04ea0890590a435 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -2384,14 +2384,20 @@ class JavaScriptBackend extends Backend {
     }
 
     if (isTreeShakingDisabled) {
-      mirrorsAnalysis.enqueueReflectiveElements(
-          enqueuer, recentClasses, compiler.libraryLoader.libraries);
+      enqueuer.applyImpact(
+          compiler.impactStrategy,
+          mirrorsAnalysis.computeImpactForReflectiveElements(recentClasses,
+              enqueuer.processedClasses, compiler.libraryLoader.libraries,
+              forResolution: enqueuer.isResolutionQueue));
     } else if (!targetsUsed.isEmpty && enqueuer.isResolutionQueue) {
       // Add all static elements (not classes) that have been requested for
       // reflection. If there is no mirror-usage these are probably not
       // necessary, but the backend relies on them being resolved.
-      mirrorsAnalysis.enqueueReflectiveStaticFields(
-          enqueuer, _findStaticFieldTargets());
+      enqueuer.applyImpact(
+          compiler.impactStrategy,
+          mirrorsAnalysis.computeImpactForReflectiveStaticFields(
+              _findStaticFieldTargets(),
+              forResolution: enqueuer.isResolutionQueue));
     }
 
     if (mustPreserveNames) reporter.log('Preserving names.');