make buildworld is now 50% slower

[Daniel Braniss]

Hi,
after today's update of 9.1-STABLE I noticed that make build[world|kernel] are
taking conciderable more time, is it because the upgrade of clang?
and if so, is the code produced any better?

before:
buildwordl:	 26m4.52s real 2h28m32.12s user 36m6.27s sys
buildkernel:	 7m29.42s real 23m22.22s user 4m26.26s sys

today:
buildwordl:	34m29.80s real 2h38m9.37s user 37m7.61s sys
buildkernel:    15m31.52s real 22m59.40s user 4m33.06s sys

danny