Delete dead store buffer verification code and code that changes the store buffer in debug mode.

src/heap/store-buffer.h

Index: src/heap/store-buffer.h
diff --git a/src/heap/store-buffer.h b/src/heap/store-buffer.h
index c9d6090927effaa6879e8cd34448587d864b05f4..6c571fcdce5bd2f755e0b42c259aae231667d80f 100644
--- a/src/heap/store-buffer.h
+++ b/src/heap/store-buffer.h
@@ -83,21 +83,11 @@ class StoreBuffer {
   bool old_buffer_is_sorted() { return old_buffer_is_sorted_; }
   bool old_buffer_is_filtered() { return old_buffer_is_filtered_; }
 
-  // Goes through the store buffer removing pointers to things that have
-  // been promoted.  Rebuilds the store buffer completely if it overflowed.
-  void SortUniq();
-
   void EnsureSpace(intptr_t space_needed);
   void Verify();
 
   bool PrepareForIteration();
 
-#ifdef DEBUG
-  void Clean();
-  // Slow, for asserts only.
-  bool CellIsInStoreBuffer(Address cell);
-#endif
-
   void Filter(int flag);
 
   // Eliminates all stale store buffer entries from the store buffer, i.e.,
@@ -144,7 +134,6 @@ class StoreBuffer {
   void ClearFilteringHashSets();
 
   bool SpaceAvailable(intptr_t space_needed);
-  void Uniq();
   void ExemptPopularPages(int prime_sample_step, int threshold);
 
   void ProcessOldToNewSlot(Address slot_address,