[XeTeX] CID-keyed font support?

[Akira Kakuto]

Dear Jiang Jiang,

>> In case you or anyone else are interested, I just posted two patches
>> to xdvipdfmx to fix this problem:
>> https://gist.github.com/jjgod/c1194a9b371848aaa746

> I've succeeded (with 2 or 3 changes for late declarations
> of variables, since my compiler is foolish) with NotoSansJP-Regular.

However, in many cases of usual fonts, which are ok
in the present xdvipdfmx, the patched xdvipdfmx seems to crash.
For example,

\documentclass{article}
\usepackage{fontspec}
\begin{document}
\fontspec{[msmincho.ttc]}
This is a test. Some Japanese characters.
\end{document}

Thanks,
Akira