[patch] Make std::list safe against overloaded operator&

[Jonathan Wakely]

On 16/06/15 22:05 +0100, Jonathan Wakely wrote:
>This fixes some unsafe uses of operator& in std::list, and also in
>Debug Mode found running the new test with -D_GLIBCXX_DEBUG.

And another related patch, found after rebasing some std::list changes
I've been working on.

Tested powerpc64le-linux, committed to trunk.

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