Reapply "Use backend targets to run Kernel transformations in Fasta"

pkg/compiler/lib/src/kernel/fasta_support.dart

Index: pkg/compiler/lib/src/kernel/fasta_support.dart
diff --git a/pkg/compiler/lib/src/kernel/fasta_support.dart b/pkg/compiler/lib/src/kernel/fasta_support.dart
index dda0cffc3a2a7f04d6ed9eae0244bc07e6728395..04b4919eafd6923955e86432260ec1f72599c656 100644
--- a/pkg/compiler/lib/src/kernel/fasta_support.dart
+++ b/pkg/compiler/lib/src/kernel/fasta_support.dart
@@ -22,6 +22,7 @@ import 'package:front_end/file_system.dart';
 import 'package:front_end/physical_file_system.dart';
 import 'package:front_end/src/fasta/kernel/utils.dart';
 import 'package:kernel/ast.dart' show Source, Library;
+import 'package:kernel/target/targets.dart' show TargetFlags;
 
 import 'package:front_end/src/fasta/builder/builder.dart' show LibraryBuilder;
 import 'package:front_end/src/fasta/compiler_context.dart' show CompilerContext;
@@ -89,8 +90,7 @@ class KernelTargetForDart2js extends KernelTarget {
   KernelTargetForDart2js(
       DillTarget target, TranslateUri uriTranslator, bool strongMode,
       [Map<String, Source> uriToSource])
-      : super(PhysicalFileSystem.instance, target, uriTranslator, strongMode,
-            uriToSource);
+      : super(PhysicalFileSystem.instance, target, uriTranslator, uriToSource);
   @override
   SourceLoader<Library> createLoader() =>
       new SourceLoaderForDart2js<Library>(fileSystem, this);
@@ -139,8 +139,9 @@ class SourceLoaderForDart2js<L> extends SourceLoader<L> {
 /// Specializes [DillTarget] to build kernel for dart2js: JS-specific libraries
 /// are included in the SDK, and native clauses have no string parameter.
 class DillTargetForDart2js extends DillTarget {
-  DillTargetForDart2js(Ticker ticker, TranslateUri uriTranslator)
-      : super(ticker, uriTranslator, "none");
+  DillTargetForDart2js(Ticker ticker, TranslateUri uriTranslator,
+      {TargetFlags flags})
+      : super(ticker, uriTranslator, "none", flags: flags);
 
   @override
   Token skipNativeClause(Token token) => _skipNative(token);