[Issue 20600] C++ header output `-HC` can't write size_t correctly

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20600

--- Comment #2 from Manu <turkeyman at gmail.com> ---
I'm not sure how what you're saying relates to size_t?
I notice that when I use size_t in code, the type seems to be lost; is it just
an alias for a sized integer? It needs to retain the fact that it was specified
as size_t in the AST somehow.

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