reducing needless normal_iterator usage in vector

[Paolo Carlini]

Phil Edwards wrote:

>Thoughts?
>
Well, I find your analysis very interesting and most probably relevant 
also for other containers.
Something I would really like to understand better is how all of this 
depends on the optimization switches specified at compile time: naively, 
I hope that at -O2 the differences in the generated assembly are much 
smaller. Also: could we learn from all of this something general to 
suggest to the compiler guys?

Ciao, Paolo.