Remove --compile_all from all but one service test

runtime/observatory/tests/service/get_allocation_samples_test.dart

 // Copyright (c) 2015, 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.
-// VMOptions=--compile_all --error_on_bad_type --error_on_bad_override
+// VMOptions=--error_on_bad_type --error_on_bad_override
 
 import 'dart:developer';
 import 'package:observatory/service_io.dart';
 import 'package:observatory/cpu_profile.dart';
 import 'package:unittest/unittest.dart';
 
 import 'test_helper.dart';
 
 class Foo {
   Foo() {
@@ skipping 61 matching lines @@
       } else {
         node = node.children[0];
       }
       expect(node, isNotNull);
     }
   },
   resumeIsolate,
 ];
 
 main(args) async => runIsolateTests(args, tests, testeeConcurrent:test);