Rewrite the #includes from llvm/Foo.h to llvm/IR/Foo.h as appropriate to
reflect the migration in r171366.

Re-sort the includes as best I can with llvm/utils/sort_includes.py.

git-svn-id: https://llvm.org/svn/llvm-project/dragonegg/trunk@171368 91177308-0d34-0410-b5e6-96231b3b80d8