RFA (tree-inline): PATCH for more C++14 constexpr support

[Jason Merrill]

On 11/17/2014 05:29 AM, Richard Biener wrote:
> can you rename it to copy_fn please?  It really copies parameter and
> result and then the body.
>
> Ok with that change.

Done.  Here's what I'm checking in, along with a second patch to enable 
the new code for C++11 as well:

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