gcc: merge upstream fix and new feature.
Fix for PR c++/29928
Add support for Rvalue references as described here: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html
Obtained from: gcc 4.3 (rev. 124724, 125211; GPLv2) MFC after: 2 weeks
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