Re: Implement C++20 constexpr <algorithm>, , and <array>

["Ed Smith-Rowland via libstdc++" <libstdc++ at gcc dot gnu dot org>]

Greetings,

This patch implements C++20 constexpr for <algorithm>, <uility>, <array>.

It's a large patch but only affects C++20 and the volume is mostly test 
cases.

This differs from the previous patch in actually testing constexpr :-\ 
and in the addition of wrappers for __builtin_memmove and 
__builtin_memcmp that supply constexpr branches if C++20 and 
is_constant_evaluated().

This builds and tests clean on x86_64-linux.

OK?

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