Format as clang-format suggest. You could run clang-format or git-clang-format just for your commits by the way.
Instead of removing this file, we want to check if -mconstructor-aliases is passed in for AIX.
I don't think we want to remove the testing of our alias implementation.
Might be a dumb question, but I see this is a revert to rGb116ded, do we also want to revert the changes added to llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp?
FWIW, if clang-format is installed on your host (you can do this via homebrew on mac IIRC), arc would use it as the linter when you do arc lint or arc diff.