LLVM 3.9 has branched

[Johan Engelen via digitalmars-d-ldc]

http://lists.llvm.org/pipermail/llvm-dev/2016-July/102468.html

LLVM has branched-off 3.9. The next version is going to be 4.0.

I'll fix the lit-based testsuite for the version number change.
I'll also prepare a new LLVM binary package for AppVeyor.

cheers,
   Johan