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llvm 3.8, 3.9, 4: WIP split out compiler-rt for other versions #44206
Motivation for this change
This is good for build parallelism and cross compilation.
6 was already done, 5 is is Darwin's stdenv so holding off to avoid mass
There are some build failures to track down, however. I'm opening this so others can possibly assist.
@matthewbauer well on the other hand we already did this with the far more important LLVMs, without downstream issues IIRC, so if I can debug the two build failures here (I got locally) it should be a master-only PR that gets everything into a consistent state for the release.