Remove some leftovers of full-codegen's generators implementation.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index ddbb277f7b5cb9aef335976e244ebd614c0ae114..2d873969e3c77e8f440e22226c0d594a6f6c946a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8057,8 +8057,7 @@ class JSGeneratorObject: public JSObject {
 
   // [input_or_debug_pos]
   // For executing generators: the most recent input value.
-  // For suspended new-style generators: debug information (bytecode offset).
-  // For suspended old-style generators: unused.
+  // For suspended generators: debug information (bytecode offset).
   // There is currently no need to remember the most recent input value for a
   // suspended generator.
   DECL_ACCESSORS(input_or_debug_pos, Object)