[turbofan] Forward elements kind getter to map (in the broker)

Bug: v8:7790
Change-Id: Idc19240a6c05d4c182804351c3fc9bbd2650bfc0
Reviewed-on: https://chromium-review.googlesource.com/1181127Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55223}

src/compiler/js-heap-broker.cc

@@ -881,7 +881,6 @@ HANDLE_ACCESSOR_C(HeapObject, bool, IsSeqString)
 
 HANDLE_ACCESSOR_C(HeapNumber, double, value)
 
-HANDLE_ACCESSOR_C(JSArray, ElementsKind, GetElementsKind)
 HANDLE_ACCESSOR(JSArray, Object, length)
 
 BIMODAL_ACCESSOR(JSFunction, Map, initial_map)
@@ -889,7 +888,6 @@ HANDLE_ACCESSOR_C(JSFunction, bool, IsConstructor)
 HANDLE_ACCESSOR(JSFunction, JSGlobalProxy, global_proxy)
 HANDLE_ACCESSOR(JSFunction, SharedFunctionInfo, shared)
 
-HANDLE_ACCESSOR_C(JSObject, ElementsKind, GetElementsKind)
 HANDLE_ACCESSOR(JSObject, FixedArrayBase, elements)
 
 HANDLE_ACCESSOR(JSRegExp, Object, data)
@@ -1056,6 +1054,10 @@ base::Optional<JSObjectRef> AllocationSiteRef::boilerplate() const {
   }
 }
 
+ElementsKind JSObjectRef::GetElementsKind() const {
+  return map().elements_kind();
+}
+
 Handle<Object> ObjectRef::object() const { return data_->object; }
 
 JSHeapBroker* ObjectRef::broker() const { return data_->broker; }

src/compiler/js-heap-broker.h

@@ -352,7 +352,6 @@ class JSArrayRef : public JSObjectRef {
  public:
   using JSObjectRef::JSObjectRef;
 
-  ElementsKind GetElementsKind() const;
   ObjectRef length() const;
 };