[WIP] JSForInLowering and JSForInHasOwnProperty.

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 9d23220e82b25f5943a31adfa6b1ec94f129f269..033797b7bed816c46615b67ab56aa59bf2553c50 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -142,6 +142,10 @@ class V8_EXPORT_PRIVATE AccessBuilder final
   // Provides access to DescriptorArray::enum_cache_bridge_cache() field.
   static FieldAccess ForDescriptorArrayEnumCacheBridgeCache();
 
+  // Provides access to DescriptorArray::enum_cache_bridge_indices_cache()
+  // field.
+  static FieldAccess ForDescriptorArrayEnumCacheBridgeIndicesCache();
+
   // Provides access to Map::bit_field() byte.
   static FieldAccess ForMapBitField();