Don't layout items in a list in columns. That requires changing every
line just to add or remove a single element. What I wouldn't give to
have clang-format here an be able to format this more densely without
caring...

Re-group and sort the entries while here to make the whole thing more
clear.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191828 91177308-0d34-0410-b5e6-96231b3b80d8