Created attachment 468162 [details] ppc64 lit-build.log .
Could you retry with MAKEOPTS=-j1?
Fortunately or otherwise, it fails in exactly the same way on ppc.
Created attachment 468164 [details] lit-j1-build.log Still fails with -j1, but the failure does look different.
I've dropped ppc and ppc64 keywords on llvm and company.