[patch] Update std::experimental::{any,optional,string_view}

[Jonathan Wakely]

This updates the Library Fundamentals types to reflect the changes
approved in Urbana.

Tested x86_64-linux, committed to trunk.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: patch.txt
Type: text/x-patch
Size: 19437 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20141213/3679c4f8/attachment.bin>