Remove --compile_all from all but one service test

runtime/observatory/tests/service/read_stream_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 'package:observatory/object_graph.dart';
 import 'package:unittest/unittest.dart';
 import 'dart:typed_data';
 
 testRoundTrip(final int n) {
   var bytes = [];
   var remaining = n;
   while (remaining > 127) {
     bytes.add(remaining & 127);
@@ skipping 31 matching lines @@
     testRoundTrip(n);
     n <<= 1;
   }
 
   n = 5;
   while (n < kMaxUint64) {
     testRoundTrip(n);
     n <<= 1;
   }
 }