Clarify side effects of HTransitionElementsKind.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 10a311125a9c4be301f3881ff2c728cab6349056..ee31f59db05bd6ddd413eb3c9b6f6b0847ce8d35 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6269,11 +6269,7 @@ class HTransitionElementsKind: public HTemplateInstruction<2> {
     SetOperandAt(1, context);
     SetFlag(kUseGVN);
     SetGVNFlag(kChangesElementsKind);
-    if (original_map->has_fast_double_elements()) {
-      SetGVNFlag(kChangesElementsPointer);
-      SetGVNFlag(kChangesNewSpacePromotion);
-    }
-    if (transitioned_map->has_fast_double_elements()) {
+    if (!IsSimpleMapChangeTransition(from_kind_, to_kind_)) {
       SetGVNFlag(kChangesElementsPointer);
       SetGVNFlag(kChangesNewSpacePromotion);
     }