[turbofan] Properly handle dictionary maps in the prototype chain.

src/compilation-dependencies.h

Index: src/compilation-dependencies.h
diff --git a/src/compilation-dependencies.h b/src/compilation-dependencies.h
index a40eb7480114f2b697e5ac9d1f106f31b1794425..ca09ef5e116a82c2d87ab0fbebabb69489509bd6 100644
--- a/src/compilation-dependencies.h
+++ b/src/compilation-dependencies.h
@@ -32,9 +32,6 @@ class CompilationDependencies {
     Insert(DependentCode::kFieldTypeGroup, map);
   }
   void AssumeMapStable(Handle<Map> map);
-  void AssumePrototypeMapsStable(
-      Handle<Map> map,
-      MaybeHandle<JSReceiver> prototype = MaybeHandle<JSReceiver>());
   void AssumeMapNotDeprecated(Handle<Map> map);
   void AssumePropertyCell(Handle<PropertyCell> cell) {
     Insert(DependentCode::kPropertyCellChangedGroup, cell);