Canonical output ordering for constants.

pkg/compiler/lib/src/js_backend/namer.dart

Index: pkg/compiler/lib/src/js_backend/namer.dart
diff --git a/pkg/compiler/lib/src/js_backend/namer.dart b/pkg/compiler/lib/src/js_backend/namer.dart
index 768a0726f57d7103af5c9b87bd80c87e884f9c3d..4cd691e63c17c1d1b8415737e6faa7666acbc7fd 100644
--- a/pkg/compiler/lib/src/js_backend/namer.dart
+++ b/pkg/compiler/lib/src/js_backend/namer.dart
@@ -1888,6 +1888,8 @@ class ConstantCanonicalHasher implements ConstantValueVisitor<int, Null> {
 
   @override
   int visitDeferred(DeferredConstantValue constant, [_]) {
+    // TODO(sra): Investigate that the use of hashCode here is probably a source
+    // of instability.
     int hash = constant.prefix.hashCode;
     return _combine(hash, _visit(constant.referenced));
   }