[turbofan] First steps towards optimizing for-in loops.

src/compiler/access-builder.h

Index: src/compiler/access-builder.h
diff --git a/src/compiler/access-builder.h b/src/compiler/access-builder.h
index 26fe814652cfc9077b42c3618938437ceaace831..f0cd5e096c450fa3433ec7b6ff31245a885af823 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -37,6 +37,18 @@ class AccessBuilder final : public AllStatic {
   // Provides access to ExternalArray::external_pointer() field.
   static FieldAccess ForExternalArrayPointer();
 
+  // Provides access to DescriptorArray::enum_cache() field.
+  static FieldAccess ForDescriptorArrayEnumCache();
+
+  // Provides access to DescriptorArray::enum_cache_bridge_cache() field.
+  static FieldAccess ForDescriptorArrayEnumCacheBridgeCache();
+
+  // Provides access to Map::bit_field3() field.
+  static FieldAccess ForMapBitField3();
+
+  // Provides access to Map::descriptors() field.
+  static FieldAccess ForMapDescriptors();
+
   // Provides access to Map::instance_type() field.
   static FieldAccess ForMapInstanceType();