Prefer xrange over range for small performance gain.

Prefer xrange over range for small performance gain.

range() allocates an actual list when called.  xrange() is just an iterator
and creates the next range item on demand.  This provides a slight
performance increase.

In python 3, range will do what xrange does currently, but the upgrade will
be handled by the 2to3 tool.

(Bitbake rev: 73b40f06444cb877a5960b2aa66abf7dacbd88f0)

Signed-off-by: Bob Foerster <robert@erafx.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>