Protect from comma operator overload

[François Dumont]

Hi

 Â Â Â  While working on something else on libstdc++ I started having a 
test failing because of the missing comma overload protection in 
deque.tcc. So I looked for other similar places in the code and here is 
a patch to fix the places I found.

 Â Â Â  Let me know if it is still time to commit.

François

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