Very slow check/nativecomp build

[Lars Ingebrigtsen]

I first noticed this yesterday, and I don't know when it started, but
I'm pretty sure the compilation speed was normal some days ago, so I've
added Alan to the CCs because of the recent sym-with-pos change that was
applied a few days ago (but it may have nothing to do with anything).

With:

./configure --with-native-compilation --enable-checking=all

a make bootstrap -j16 takes:

real    15m46.201s
user    113m21.805s
sys     7m29.174s

It used to take 5 minutes on this machine.  I'm pretty sure?  Is anybody
else also seeing this, or am I totally misremembering how long it takes?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no