Migrate DDC to the new analysis driver.

pkg/dev_compiler/tool/build_sdk.dart

Index: pkg/dev_compiler/tool/build_sdk.dart
diff --git a/pkg/dev_compiler/tool/build_sdk.dart b/pkg/dev_compiler/tool/build_sdk.dart
index 7ba69c803667d9a2299de1dc482580cf54c2dda8..1cef0a291a768301d95003fd4dd15915b6a19dcf 100644
--- a/pkg/dev_compiler/tool/build_sdk.dart
+++ b/pkg/dev_compiler/tool/build_sdk.dart
@@ -13,7 +13,7 @@ import 'dart:io';
 
 import 'package:dev_compiler/src/compiler/command.dart';
 
-main(List<String> arguments) {
+main(List<String> arguments) async {
   var args = ['--no-source-map', '--no-emit-metadata'];
   args.addAll(arguments);
   args.addAll([
@@ -50,6 +50,6 @@ main(List<String> arguments) {
     'dart:web_sql'
   ]);
 
-  var result = compile(args);
+  var result = await compile(args);
   exit(result);
 }