[ic] Support non-code handlers in megamorphic stub cache.

src/field-index.h

Index: src/field-index.h
diff --git a/src/field-index.h b/src/field-index.h
index 404c0f613f7ce8367feaf9ba960c4d97aac8a937..f52fd01bd841ae3b3659fe7353aa37819f0bc86c 100644
--- a/src/field-index.h
+++ b/src/field-index.h
@@ -27,7 +27,6 @@ class FieldIndex final {
   static FieldIndex ForInObjectOffset(int offset, Map* map = NULL);
   static FieldIndex ForDescriptor(Map* map, int descriptor_index);
   static FieldIndex ForLoadByFieldIndex(Map* map, int index);
-  static FieldIndex ForLoadByFieldOffset(Map* map, int index);
   static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index);
   static FieldIndex FromFieldAccessStubKey(int key);