Run llvm/utils/sort_includes.py over the Clang tools code. This doesn't
always produce as pretty of results as it does in LLVM and Clang, but
I don't mind and the value of having a single canonical ordering is very
high IMO.

Let me know if you spot really serious problems here.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@198703 91177308-0d34-0410-b5e6-96231b3b80d8