[v3] libstdc++/51142

[Paolo Carlini]

Hi,

this fixes the problem submitter noticed by implementing LWG 2059, which 
seems a good thing to do anyway, instead of just fixing the specific 
erase calls in the debug-mode code. The patch seems big, but actually is 
straightforward and limited to C++11, thus I mean to apply it to the 
branch too pretty soon.

Tested x86_64-linux, normal-mode and debug-mode.

Thanks,
Paolo.

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