[Patch] libstdc++/28080 (partial)

[Paolo Carlini]

Paolo Carlini wrote:

> while working on something else, I noticed that by tweaking the 
> codecvt_members.cc includes and consistently using __CHAR_BIT__ in 
> stl_bvector.h too we can avoid including <climits> anywhere in the 
> headers.

In fact, I have been able to beef up the patch to a decent improvement 
on libstdc++/28080: most of the times we can avoid including the big 
stl_algo.h because stl_algobase.h is enough. That is consistent with the 
original motivation of the split, I think. For example, for:

    #include <string>

the preprocessed output goes from 482992 bytes to 361737 bytes.

Again, tested x86/x86-64, both locale models, also without PCHs.

Paolo.

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