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

pkg/front_end/lib/src/fasta/compile_platform.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.compile_platform;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show exitCode;
 
 import 'compiler_command_line.dart' show CompilerCommandLine;
 
 import 'compiler_context.dart' show CompilerContext;
 
 import 'dill/dill_target.dart' show DillTarget;
 
 import 'errors.dart' show InputError;
 
 import 'kernel/kernel_target.dart' show KernelTarget;
 
 import 'kernel/utils.dart' show printProgramText, writeProgramToFile;
 
 import 'ticker.dart' show Ticker;
 
 import 'translate_uri.dart' show TranslateUri;
 
+import 'package:kernel/target/targets.dart' show TargetFlags;
+
 const int iterations = const int.fromEnvironment("iterations", defaultValue: 1);
 
 Future mainEntryPoint(List<String> arguments) async {
   for (int i = 0; i < iterations; i++) {
     if (i > 0) {
       print("\n");
     }
     try {
       await compilePlatform(arguments);
     } on InputError catch (e) {
@@ skipping 27 matching lines @@
   ticker.logMs("Parsed arguments");
   if (ticker.isVerbose) {
     print("Generating outline of $patchedSdk into $outlineOutput");
     print("Compiling $patchedSdk to $fullOutput");
   }
 
   TranslateUri uriTranslator = await TranslateUri
       .parse(c.fileSystem, patchedSdk, packages: c.options.packages);
   ticker.logMs("Read packages file");
 
-  DillTarget dillTarget =
-      new DillTarget(ticker, uriTranslator, c.options.target);
-  KernelTarget kernelTarget = new KernelTarget(c.fileSystem, dillTarget,
-      uriTranslator, c.options.strongMode, c.uriToSource);
+  DillTarget dillTarget = new DillTarget(
+      ticker, uriTranslator, c.options.target,
+      flags: new TargetFlags(strongMode: c.options.strongMode));
+  KernelTarget kernelTarget =
+      new KernelTarget(c.fileSystem, dillTarget, uriTranslator, c.uriToSource);
 
   kernelTarget.read(Uri.parse("dart:core"));
   await dillTarget.buildOutlines();
   var outline = await kernelTarget.buildOutlines();
 
   await writeProgramToFile(outline, outlineOutput);
   ticker.logMs("Wrote outline to ${outlineOutput.toFilePath()}");
 
   if (exitCode != 0) return null;
 
   var program = await kernelTarget.buildProgram(verify: c.options.verify);
   if (c.options.dumpIr) printProgramText(program);
   await writeProgramToFile(program, fullOutput);
   ticker.logMs("Wrote program to ${fullOutput.toFilePath()}");
   await kernelTarget.writeDepsFile(fullOutput, deps);
 }