[Patch] Improve (more!) performance-wise __pad::_S_pad

[Paolo Carlini]

Hi,

the below version, which only has the if-else tweaked, shaves
another quarter second:

baseline
--------
9.820u 0.040s 0:09.99 98.6%     0+0k 0+0io 193pf+0w

__pad_2 patch
-------------
8.550u 0.040s 0:08.63 99.5%     0+0k 0+0io 194pf+0w

Tested x86-linux. Will commit soon, if nobody objects...

Paolo.

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