[PATCH] Fix std::experimental::shared_ptr SFINAE constraints

[Jonathan Wakely]

On 19/10/16 10:35 +0100, Jonathan Wakely wrote:
>There are lots of SFINAE checks missing from experimental::shared_ptr,
>and we even test that shared_ptr<base[]>(new derived[1]) works, when
>it should be ill-formed.

Moar tests!

Tested powerpc64le-linux, committed to trunk.

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