[8.0.0 Release] Release Candidate 5 sources, docs, and binaries available

Hello everyone,

Source code, docs, and (a few) binaries for LLVM-8.0.0-rc5 are now
available at LLVM 8.0.0 Release Candidates

More binaries will be added as they become available.

So far this looks like it will be the last release candidate before
the final tag, which will come soon, so if you find any issues, please
let me know as soon as possible by filing a bug blocking