Simple non-incremental compaction by evacuation.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 1a8c5f338c949ecd50de9b0a6abf04ebc1768ef3..6aee45b851fdb7c47a5d79cd6d4a1d3c3776573f 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2451,12 +2451,6 @@ JSFunction* Map::unchecked_constructor() {
 }
 
 
-FixedArray* Map::unchecked_prototype_transitions() {
-  return reinterpret_cast<FixedArray*>(
-      READ_FIELD(this, kPrototypeTransitionsOffset));
-}
-
-
 Code::Flags Code::flags() {
   return static_cast<Flags>(READ_INT_FIELD(this, kFlagsOffset));
 }