[Patch] Uglify some names in _Rb_tree

[Paolo Carlini]

Hi,

I'm working on implementing completely N1780 for 4.2, the missing insert
at lower bound bits (*), would be libstdc++/22102, and noticed that we
have got a few more non-uglifyed names, dating back to the original
HP/SGI code.

Tested x86-linux.

Paolo.

(*) The idea is that _M_insert_equal(const _Val&) will gain a *_lower
variant, and rather straightforward adjustments elsewhere.

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