[patch] Apply LWG 2399, 2400 and 2401 to std::shared_ptr and std::function

[Jonathan Wakely]

These issues just became DRs in Urbana.

Tested x86_64-linux, committed to trunk.

The other new DRs we need to make changes for are 2212 (to shuffle
some code between headers), 2217 (which I sent an email about earlier)
and 2354 (adding some new insert overloads in RB trees).

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