llvm-toolchain-3.7 is marked for autoremoval from testing

[Debian testing autoremoval watch]

llvm-toolchain-3.7 1:3.7.1-2 is marked for autoremoval from testing on 2016-09-04

It is affected by these RC bugs:
818380: clang-3.7: __builtin_return_address() segfaults on s390x