C++ PATCH for c++/85545, ICE with noexcept static_cast

[Jason Merrill]

On Fri, Apr 27, 2018 at 11:00 AM, Jason Merrill <jason@redhat.com> wrote:
> With Nathan's patch for 85437, constexpr evaluation now breaks open a
> PTRMEM_CST that has a non-qualification conversion.  Then actually
> performing the conversion means messing with the contents of the
> CONSTRUCTOR.

And some follow-on tweaks, for trunk only:
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