Bug#1000858: release.debian.org: block llvm-toolchain-9 binNMU 1:9.0.1-20+b1 from migrating to testing

[Andreas Beckmann <anbe@debian.org>]

Package: release.debian.org
Severity: normal

Please block yesterdays llvm-toolchain-9 binNMU 1:9.0.1-20+b1 (and
probably any further binNMUs as well) from migrating to testing.
It introduces a regression when compiling OpenCL code from pocl by
segfaulting in libclang-cpp9 (#1000838). Simple reproducer:
  apt-get install pocl-opencl-icd clinfo
  clinfo
So far I could observe these segmentation faults on amd64, i386, arm64.

According to Sylvestre, this will be fixed only by the removal of
llvm-toolchain-9.

Andreas