vector<bool> _M_start and 0 offset

Sat Sep 29 08:56:00 GMT 2018

Hello,

here is a clang-friendly version of the patch (same changelog), tested a 
while ago. Is it ok or do you prefer something like the

+ if(this->_M_impl._M_start._M_offset != 0) __builtin_unreachable();

version suggested by FranÃ§ois?

-- 
Marc Glisse
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