Package LLVM 4.0.1 bugfix release

[daniel-j-h]

• http://lists.llvm.org/pipermail/llvm-announce/2017-July/000074.html
• http://releases.llvm.org/download.html

[springmeyer]

👍 I will take this on.

[springmeyer]

Packages are published and new docs on the process to create them are ready for review at #452. Will close this now and track at #452