Add ConstantUse to WorldImpact

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

Index: pkg/compiler/lib/src/js_backend/impact_transformer.dart
diff --git a/pkg/compiler/lib/src/js_backend/impact_transformer.dart b/pkg/compiler/lib/src/js_backend/impact_transformer.dart
index 1c6312e4e351b53666657d47ea08846cc93d6dde..b3e04547ce036bb35015c3947ffdc2db6fd3ebcf 100644
--- a/pkg/compiler/lib/src/js_backend/impact_transformer.dart
+++ b/pkg/compiler/lib/src/js_backend/impact_transformer.dart
@@ -20,7 +20,7 @@ import '../native/native.dart' as native;
 import '../options.dart';
 import '../universe/feature.dart';
 import '../universe/use.dart'
-    show StaticUse, StaticUseKind, TypeUse, TypeUseKind;
+    show ConstantUse, StaticUse, StaticUseKind, TypeUse, TypeUseKind;
 import '../universe/world_impact.dart' show TransformedWorldImpact, WorldImpact;
 import '../util/util.dart';
 import 'backend.dart';
@@ -334,9 +334,6 @@ class JavaScriptImpactTransformer extends ImpactTransformer {
 }
 
 class CodegenImpactTransformer {
-  // TODO(johnniwinther): Remove this need for this.
-  final JavaScriptBackend _backend;
-
   final CompilerOptions _options;
   final ElementEnvironment _elementEnvironment;
   final BackendHelpers _helpers;
@@ -350,9 +347,9 @@ class CodegenImpactTransformer {
   final OneShotInterceptorData _oneShotInterceptorData;
   final LookupMapAnalysis _lookupMapAnalysis;
   final CustomElementsCodegenAnalysis _customElementsCodegenAnalysis;
+  final RuntimeTypesChecksBuilder _rtiChecksBuilder;
 
   CodegenImpactTransformer(
-      this._backend,
       this._options,
       this._elementEnvironment,
       this._helpers,
@@ -365,7 +362,8 @@ class CodegenImpactTransformer {
       this._mirrorsData,
       this._oneShotInterceptorData,
       this._lookupMapAnalysis,
-      this._customElementsCodegenAnalysis);
+      this._customElementsCodegenAnalysis,
+      this._rtiChecksBuilder);
 
   void onIsCheckForCodegen(
       ResolutionDartType type, TransformedWorldImpact transformed) {
@@ -424,15 +422,10 @@ class CodegenImpactTransformer {
       }
     }
 
-    for (ConstantValue constant in impact.compileTimeConstants) {
-      _backend.computeImpactForCompileTimeConstant(constant, transformed,
-          forResolution: false);
-      _backend.addCompileTimeConstantForEmission(constant);
-    }
-
     for (Pair<ResolutionDartType, ResolutionDartType> check
         in impact.typeVariableBoundsSubtypeChecks) {
-      _backend.registerTypeVariableBoundsSubtypeCheck(check.a, check.b);
+      _rtiChecksBuilder.registerTypeVariableBoundsSubtypeCheck(
+          check.a, check.b);
     }
 
     for (StaticUse staticUse in impact.staticUses) {