Read platform.dill in the VM.

pkg/kernel/lib/binary/ast_to_binary.dart

Index: pkg/kernel/lib/binary/ast_to_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_to_binary.dart b/pkg/kernel/lib/binary/ast_to_binary.dart
index 2c87df570979b7c95ebca030b559d3357531f6bd..2decd238f8a459aedbd4e3f93e7ff8b9018e985b 100644
--- a/pkg/kernel/lib/binary/ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/ast_to_binary.dart
@@ -146,6 +146,9 @@ class BinaryPrinter extends Visitor {
     writeStringReference(node.name);
   }
 
+  StringIndexer get stringIndexer => _stringIndexer;
+  void flush() => _flush();
+
   void writeProgramFile(Program program) {
     program.computeCanonicalNames();
     writeMagicWord(Tag.ProgramFile);