Fix issue 571: display descriptive names for code objects from snapshot.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index f912fc52432ff6907adc28963c4551a1aabe4c99..5c0aa0cfce94448ca476c964e4ec858978c511fa 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -358,6 +358,8 @@ DEFINE_bool(log_code, false,
 DEFINE_bool(log_gc, false,
             "Log heap samples on garbage collection for the hp2ps tool.")
 DEFINE_bool(log_handles, false, "Log global handle events.")
+DEFINE_bool(log_snapshot_positions, false,
+            "log positions of (de)serialized objects in the snapshot.")
 DEFINE_bool(log_state_changes, false, "Log state changes.")
 DEFINE_bool(log_suspect, false, "Log suspect operations.")
 DEFINE_bool(log_producers, false, "Log stack traces of JS objects allocations.")