[v3] Fix bitset::operator[] const in debug/profile mode

[Paolo Carlini]

Hi,

noticed this while investigating the spurious failure of 
bitset/operations/constexpr.cc in debug-mode. Unfortunately debug-mode 
bitset checking is pretty weak in C++0x mode (for other reasons too), 
but at least now the operator is conforming and the testsuite is clean.

Committed to mainline.

Thanks,
Paolo.

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