Zonify types in compiler frontend

src/types.h

Index: src/types.h
diff --git a/src/types.h b/src/types.h
index 55bd09484d646f2693451d55042d88ddf0199a17..9e6cdef1a154eec821c23dd65def11fa42aa6fbb 100644
--- a/src/types.h
+++ b/src/types.h
@@ -494,8 +494,8 @@ struct HeapTypeConfig {
   }
 };
 
-typedef TypeImpl<ZoneTypeConfig> ZoneType;
-typedef TypeImpl<HeapTypeConfig> Type;
+typedef TypeImpl<ZoneTypeConfig> Type;
+typedef TypeImpl<HeapTypeConfig> HeapType;
 
 
 // A simple struct to represent a pair of lower/upper type bounds.
@@ -548,8 +548,7 @@ struct BoundsImpl {
   }
 };
 
-typedef BoundsImpl<ZoneTypeConfig> ZoneBounds;
-typedef BoundsImpl<HeapTypeConfig> Bounds;
+typedef BoundsImpl<ZoneTypeConfig> Bounds;
 
 
 } }  // namespace v8::internal