[c++] fold offsetof by hand

[Mark Mitchell]

Richard Henderson wrote:

>Yaye.  This was easier than I thought.  All it takes for C++ is to
>delay resolution in the template case.
>  
>
You should be checking whether or not the expression is dependent, not 
whether or not we are in a template.  Otherwise, we'll get various 
subtle semantics wrong.

-- 
Mark Mitchell
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