Analysis shows that "bitbake core-image-ptest-all" spends a lot of
time in scenequeue_updatecounters and much of it is rebuilding a set
which doens't change. Reorder the code to avoid that performance
glitch.
(Bitbake rev: 923c19b9713e398d8e66e6d4422dfd4c18a03486)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>