Relax TransitionElementsKind DependsOn/Changes dependencies.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 069642ae8c75210d638024126c784db225cbb6b4..7efe4b96aa8d305ac1b7a45c02eabb95bbf91b6c 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4191,15 +4191,18 @@ class HTransitionElementsKind: public HTemplateInstruction<1> {
         transitioned_map_(transitioned_map) {
     SetOperandAt(0, object);
     SetFlag(kUseGVN);
+    // DependsOn flags for TransitionElementsKinds only effect instruction
+    // hoisting, which could change their location relative to instructions that
+    // have side-effects. GVN duplicate value elimination handles
+    // TransitionElementsKinds specially, ensuring the no-op transitions are
+    // always eliminated.
     SetGVNFlag(kDependsOnMaps);
     SetGVNFlag(kChangesElementsKind);
     if (original_map->has_fast_double_elements()) {
       SetGVNFlag(kChangesElementsPointer);
-      SetGVNFlag(kDependsOnElementsPointer);
       SetGVNFlag(kDependsOnDoubleArrayElements);
     } else if (transitioned_map->has_fast_double_elements()) {
       SetGVNFlag(kChangesElementsPointer);
-      SetGVNFlag(kDependsOnElementsPointer);
       SetGVNFlag(kDependsOnArrayElements);
     }
     set_representation(Representation::Tagged());