Inline Map::has_code_cache() into its one caller.

src/objects/map.h

Index: src/objects/map.h
diff --git a/src/objects/map.h b/src/objects/map.h
index 6d0526b389c36eb5f15602b609e0ad0dedcd4638..280544020aa432b40a5da07c6dbbc9ca987c97d8 100644
--- a/src/objects/map.h
+++ b/src/objects/map.h
@@ -320,9 +320,6 @@ class Map : public HeapObject {
   inline void set_is_access_check_needed(bool access_check_needed);
   inline bool is_access_check_needed();
 
-  // Returns true if map has a non-empty stub code cache.
-  inline bool has_code_cache();
-
   // [prototype]: implicit prototype object.
   DECL_ACCESSORS(prototype, Object)
   // TODO(jkummerow): make set_prototype private.