pfg 005e0d33a7 minor perf enhancement for UTF-8
Reduce some duplicate code.

Reference:
https://www.illumos.org/issues/628

Obtained from:	Illumos
MFC after:	1 week
2014-07-04 22:39:39 +00:00
..
2014-07-04 22:39:39 +00:00