Bug#906314: llvm-6.0 unable to build julia 0.7/1.0

[Lumin]

Package: llvm-6.0-dev
Version: 1:6.0.1-4
Severity: important
Justification: blocking RC bug
Control: block 905807 by -1
Control: tag -1 +patch +confirmed

Debian's llvm should add this patch
https://reviews.llvm.org/D43781

And this patch has been verified by Frédéric
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=906265#30

With this patch we can build Julia on ppc64el again.