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[RFC 2/*] Benchmarking memmem


continuing check memchr and memcmp were ok.

When we look to memmem from results it is not clear if simple_memmem is
slower or faster or what.

                        simple_memmem memmem
String 00000, offset 0: 120 290
String 00000, offset 7: 154 290
String 00000, offset 14:  204 290
String 00000, offset 21:  290 306
String 00000, offset 28:  324 298
String 00000, offset 35:  350 298
String 00000, offset 42:  382 298
String 00000, offset 49:  410 306
String 00000, offset 56:  442 306
String 00000, offset 63:  468 306
String 00000, offset 70:  510 314
String 00000, offset 77:  528 314
String 00000, offset 84:  562 306
String 00000, offset 91:  588 314
String 00000, offset 98:  620 314
String 00000, offset 105: 646 324
String 00000, offset 112: 680 316
String 00000, offset 119: 706 324
...
String 00000111110000022222, offset 0:  178 698
String 00000111110000022222, offset 7:  214 698
String 00000111110000022222, offset 14: 264 706
String 00000111110000022222, offset 21: 366 714
String 00000111110000022222, offset 28: 392 714
String 00000111110000022222, offset 35: 418 714
String 00000111110000022222, offset 42: 452 714
String 00000111110000022222, offset 49: 486 714
String 00000111110000022222, offset 56: 520 714
String 00000111110000022222, offset 63: 544 722
String 00000111110000022222, offset 70: 570 722
String 00000111110000022222, offset 77: 604 722
String 00000111110000022222, offset 84: 630 732
String 00000111110000022222, offset 91: 664 724
String 00000111110000022222, offset 98: 688 732
String 00000111110000022222, offset 105:  724 732
String 00000111110000022222, offset 112:  750 732
String 00000111110000022222, offset 119:  784 722



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