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2017-02-26T18:47:48.117175Z
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Upgrade cloudabi-toolchain to use LLVM 4.0-rc2.

With the release of LLVM 4.0 nearby, let's go ahead and switch over the
cloudabi-toolchain port to use the devel/llvm40 port. This allows us to
experiment with lots of C++17 features that aren't supported by
devel/llvm39 yet.

END