Bump minimal supported LLVM version to 9 This bumps the minimal tested llvm version to 9. This should enable supporting newer LLVM features (and CPU extensions). This was motived by #78361 having to drop features because of LLVM 8 not supporting certain CPU extensions yet. This was declared relatively uncontroversial on [Zulip](https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Min.20Supported.20LLVM.20Upgrade.20Process.3F/near/215957859). Paging ````@eddyb```` because there was a comment in the [dockerfile](https://github.com/rust-lang/rust/blob/master/src/ci/docker/host-x86_64/x86_64-gnu-llvm-8/Dockerfile#L42) describing a hack (which I don't quite understand) which was also blocked by not having LLVM 9. |
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