[Patch] To string::find

[Paolo Carlini]

Hi,

the below is the complete patch I tested on x86 and x86_64. The 
performance number I'm getting are consistently better than the current 
ones and, after all, we are talking about the same algorithm of glibc' 
memmem, and also the same of the old string::find + a "trivial"  but 
effective optimization, something trustworthy. For example, on a dual 
core Athlon 64 2200+, for our string::find performance testcase:

Current
3.996u 0.000s 0:03.99 100.0%    0+0k 0+0io 0pf+0w

Patched
2.728u 0.000s 0:02.72 100.0%    0+0k 0+0io 0pf+0w

Tomorrow I'd like to go ahead...

Paolo.

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