[cleanup] Re-sort the #include lines using llvm/utils/sort_includes.py

No functionality changed, this is a purely mechanical cleanup to ensure
the #include order remains consistent across the project.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@225975 91177308-0d34-0410-b5e6-96231b3b80d8