Add missing CTFloat::hash function to ctfloat.h

[ibuclaw]

Added to D implementation in #6418

[dlang-bot]

Thanks for your pull request, @ibuclaw!

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[wilzbach]

It's more than time that we generate these files.
@UplinkCoder @RazvanN7 do you remember #5082?
If using DMD as a library is too complicated, libdparse would do a fine job as well.
Is this generator on your roadmap?

[UplinkCoder]

@wilzbach
Currently using the compiler as a library is infeasible.
However, I could do a c++ hdrgen switch for dmd akin to -H. Maybe -Hc ?

[wilzbach]

Currently using the compiler as a library is infeasible.

What's missing?

However, I could do a c++ hdrgen switch for dmd akin to -H. Maybe -Hc?

Oh I am not sure that's a good idea (except you can revive @yebblies's PR). The Unix philosophy is to do one step and do it will. DMD already does a lot of things ... with a full Bugzilla list, so imho doing this in a separate tool would be better.
As mentioned, if DMD as a library isn't ready yet, it shouldn't be a big deal to do this with libdparse.
What do other people think about this @yebblies, @andralex, @ibuclaw, @WalterBright?