[v3] libstdc++/42491

[Benjamin Kosnik]

This is about running C++0x code in the performance testsuite, namely
<future> type stuff. Well, one solution is to just run all the
performance suite with -gnu=stdc++0x. And since that seems simple
and easy, I did that. At some point in the future we may want to do
dual-runs, or something more elaborate. 

This kind of leads us to PR42634, as it now is triggered via 'make
check-performance'. Although not great, it doesn't seem like it's worth
waiting for that to be fixed before this goes in.

tested x86/linux

-benjamin
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