fix #27771, create directory if needed

pkg/dev_compiler/lib/src/compiler/command.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.
 
 import 'dart:io';
 import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:analyzer/src/summary/package_bundle_reader.dart'
     show InSummarySource;
 import 'package:args/args.dart' show ArgParser, ArgResults;
 import 'package:args/command_runner.dart' show UsageException;
@@ skipping 152 matching lines @@
         : outPaths.map((p) =>
             '${path.withoutExtension(p)}.${compilerOpts.summaryExtension}');
 
     // place next to every compiled module
     for (var summaryPath in summaryPaths) {
       // Only overwrite if summary changed.  This plays better with timestamp
       // based build systems.
       var file = new File(summaryPath);
       if (!file.existsSync() ||
           _changed(file.readAsBytesSync(), module.summaryBytes)) {
+        if (!file.parent.existsSync()) file.parent.createSync(recursive: true);
         file.writeAsBytesSync(module.summaryBytes);
       }
     }
   }
 }
 
 String _moduleForLibrary(
     String moduleRoot, Source source, CompilerOptions compilerOpts) {
   if (source is InSummarySource) {
     var summaryPath = source.summaryPath;
@@ skipping 20 matching lines @@
     '\n\n${_argParser.usage}';
 
 void _usageException(String message) {
   throw new UsageException(message, _usageMessage);
 }
 
 /// Thrown when the input source code has errors.
 class CompileErrorException implements Exception {
   toString() => '\nPlease fix all errors before compiling (warnings are okay).';
 }