Bug 1517684 - Fix obsolete comment

--HG--
extra : rebase_source : dd442e29c1900812b2210528abc3efd8f4b2620c
extra : source : ffd9223540ab9a1ac8c2a0544db6ec76d2447086

js/src/gc/GC.cpp

@@ -670,8 +670,7 @@ static inline bool FinalizeTypedArenas(FreeOp* fop, Arena** src,
 }
 
 /*
- * Finalize the list. On return, |al|'s cursor points to the first non-empty
- * arena in the list (which may be null if all arenas are full).
+ * Finalize the list of areans.
  */
 static bool FinalizeArenas(FreeOp* fop, Arena** src, SortedArenaList& dest,
                            AllocKind thingKind, SliceBudget& budget,