Bug#884541: llvm-toolchain-3.9: do not release with buster

[Gianfranco Costamagna]

control: severity -1 important

On Sat, 16 Dec 2017 15:38:17 +0100 Mattia Rizzolo <mattia at debian.org> wrote:
> Source: llvm-toolchain-3.9
> Version: 1:3.9.1-10
> Severity: serious
> 
> We have too many llvm releases already.
> This bug is to prevent testing migration once it gets removed.
> 

I'm downgrading this one, because we need 3.9 for ghc 8.2 (currently transitioning in unstable).

with ghc 8.2, llvm 3.7 can finally go away
ghc 8.4 will use llvm 5.0, but it is not LTS right now, so the transition will probably happen in some months,
this is why I'm downgrading this bug, to let the new haskell stack have an higher chance to migrate when the rebuilds will
be issued, or at least having a better view from Britney POV.

(I hope ghc 8.6 in august will use llvm 6.0!)

Gianfranco