[dart2wasm] Temporarily make opaqueTrue a runtime decision

Issue #62113

Change-Id: Ib15328f935c63c28e8f5911ef9a035821eaf6685
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/475620
Reviewed-by: Nate Biggs <natebiggs@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>

Author: mkustermann

pkg/dart2js_runtime_metrics/lib/_opaque_bool_other.dart

@@ -2,8 +2,12 @@
 // 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.
 
+// TODO(http://dartbug.com/62113): Remove this runtime decision once we can make
+// this a compile-time constant but still retain protobuf messages & fields.
+final _true = int.parse('1') == 1;
+
 /// See [_opaque_bool_dart2js.dart].
-bool get opaqueTrue => true;
+bool get opaqueTrue => _true;
 
 /// See [_opaque_bool_dart2js.dart].
-bool get opaqueFalse => false;
+bool get opaqueFalse => !_true;