Fixes for AST <-> binary serialization.

pkg/kernel/lib/binary/ast_from_binary.dart

Index: pkg/kernel/lib/binary/ast_from_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index d060020ba003382cd7bb9f95a2a40925c0e378b9..c31c255fad35df059bfe5428fec957e243082c4e 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -1276,7 +1276,8 @@ class BinaryBuilder {
         type: readDartType(),
         initializer: readExpressionOption(),
         isFinal: flags & 0x1 != 0,
-        isConst: flags & 0x2 != 0)
+        isConst: flags & 0x2 != 0,
+        isFieldFormal: flags & 04 != 0)
       ..fileOffset = offset
       ..fileEqualsOffset = fileEqualsOffset;
   }