[patch] fold-const.c: Reorganize fold - Part 1/n

[Mark Mitchell]

Roger Sayle wrote:

> Hopefully everyone should find this satisfactory.  Mark, are you
> OK with this single source file exception/tweak to the current
> plan/rules?  I'd expect few, if any, of the development branches
> contain any changes to fold, and they're welcome to maintain those
> changes locally until the prescribed time, but I thought I'd make
> the offer anyway.

Yes, that's eminently sensible.  Thanks for making yourself available!

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Mark Mitchell
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