[Patch] Tiny improvement for libstdc++/11602

[Paolo Carlini]

Hi,

in order to really fix this performance problem drastic changes are
needed, most probably avoiding completely wcrtomb & co.

Anyway, the change below is really straighrforward and does a little
good. On my machine (P4-2400, -O2), for cspeed.cc, codecvt 100000:

3.4
---
15.590u 0.000s 0:15.87 98.2%    0+0k 0+0io 228pf+0w

3.4 + patch below
-----------------
9.600u 0.000s 0:09.76 98.3%     0+0k 0+0io 187pf+0w

Regression tested x86-linux. Barring objections, will commit soon.

Paolo.

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