Handle int constant

tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart

Index: tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
diff --git a/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart b/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
index 66bfd8245f23e33f55794eb21f09b7210f2fc0b7..c0eeba9a28e5df8d2ce334ecfda957694e6c9a69 100644
--- a/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
+++ b/tests/compiler/dart2js/deferred_follow_constant_dependencies_test.dart
@@ -16,12 +16,8 @@ void main() {
     CompilationResult result =
         await runCompiler(memorySourceFiles: MEMORY_SOURCE_FILES);
     Compiler compiler = result.compiler;
-    var outputUnitForElement = compiler.deferredLoadTask.outputUnitForElement;
     var outputUnitForConstant = compiler.deferredLoadTask.outputUnitForConstant;
     var mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit;
-    var lib =
-        compiler.libraryLoader.lookupLibrary(Uri.parse("memory:lib.dart"));
-    var backend = compiler.backend;
     List<ConstantValue> allConstants = [];
 
     addConstantWithDependendencies(ConstantValue c) {
@@ -29,7 +25,9 @@ void main() {
       c.getDependencies().forEach(addConstantWithDependendencies);
     }
 
-    backend.constants.compiledConstants.forEach(addConstantWithDependendencies);
+    var codegenWorldBuilder = compiler.codegenWorldBuilder;
+    codegenWorldBuilder.compiledConstants
+        .forEach(addConstantWithDependendencies);
     for (String stringValue in ["cA", "cB", "cC"]) {
       ConstantValue constant = allConstants.firstWhere((constant) {
         return constant.isString && constant.primitiveValue == stringValue;