[Patch] Implementation of n3793 <experimental/optional>

[Luc Danton]

On 2013-11-02 23:31, Paolo Carlini wrote:
>
> In general we are very careful with code bloat, but free functions which just forward to other functions should be definiyely inline, otherwise typically at widely used optimization levels like -O2 users get suboptimal performance for no reason. But please feel free to experiment and report your findings on the mailing list!
>
> Paolo
>
>
>

After review, the free functions that only ever forward to something 
else and are not implicitly inline appear to be that 
__constexpr_addressof overload and non-member swap. Here's a patch 
(against master) that marks them inline, all tests pass. I briefly and 
casually attempted to notice any effect, but to be honest in my smallish 
testcases GCC appeared to already see through everything.
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