Bug#819278: clone for buster

[Santiago Vila]

severity 819278 serious
clone 819278 -1
clone 819278 -2
reassign -1 llvm-toolchain-6.0
reassign -2 llvm-toolchain-7
retitle -1 llvm-toolchain-6.0: Test suite hangs the autobuilder on single-CPU systems
retitle -2 llvm-toolchain-7: Test suite hangs the autobuilder on single-CPU systems
thanks

I'm going to submit patches next, they will just disable the "LLD"
tests, which are the ones that are known to fail.

Note: I'm changing the severity according to Policy 4.2:

 If build-time dependencies are specified, it must be possible to build
 the package and produce working binaries on a system with only
 essential and build-essential packages installed and also those
 required to satisfy the build-time relationships (including any
 implied relationships).

Thanks.