[kernel] debugging for in statement

pkg/kernel/binary.md

Index: pkg/kernel/binary.md
diff --git a/pkg/kernel/binary.md b/pkg/kernel/binary.md
index 71f3d9461824a429f1b36587f0112b3c744227a9..c6a2154add5b6faa5dc879e977429b371f8bb324 100644
--- a/pkg/kernel/binary.md
+++ b/pkg/kernel/binary.md
@@ -722,6 +722,7 @@ type ForStatement extends Statement {
 
 type ForInStatement extends Statement {
   Byte tag = 70;
+  FileOffset fileOffset; // note that this is actually the body offset
   VariableDeclaration variable;
   Expression iterable;
   Statement body;
@@ -729,6 +730,7 @@ type ForInStatement extends Statement {
 
 type AsyncForInStatement extends Statement {
   Byte tag = 80; // Note: tag is out of order.
+  FileOffset fileOffset; // note that this is actually the body offset
   VariableDeclaration variable;
   Expression iterable;
   Statement body;