Update to LLVM v9.0.0

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LLVM v9.0.0 was just released and both libLLVM and the bindings should be updated to use it.

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Most, but not all, of the pre-built binaries are up now (http://releases.llvm.org/download.html#9.0.0), so I can likely start on this soon.

Any updates on this?

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The libLLVM binaries are not built for the majority of the platforms by default, so it will require some time/effort to build them manually instead.

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I have machines setup for the various distro's that are built by default. I've started the work on getting libLLVM built for each.

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I have win-x86, win-x64 done (pre-built)

I have also completed ubuntu-1604, ubuntu-1804, ubuntu-1904, freebsd-x86, and freebsd-x64 (locally built, as pre-built binaries don't exit)

The macOS build is going now and packages can start being pushed once that completes.

I still need to build linux-arm, linux-arm64, and sles to round out the package list.

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This is done now with #121. I'm logging issue tracking the remaining rid specific packages.