[patch] Fix bug in experimental::any

[Jonathan Wakely]

This fixes the uses-allocator construction in experimental::any and
re-orders the data members so that I can extract the stored value in a
Python printer without having to walk the inheritance hierarchy of a
std::tuple.

The actual pretty printer for any (and string_view and optional) will
follow Real Soon Now.

Tested x86_64-linux, committed to trunk.

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