[polly] [clang] [clang-format] Add Automatic and ExceptShortType options for AlwaysBreakAfterReturnType. (PR #78011)

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rmarker wrote:

Thanks, @owenca.
Don't know if you want to wait for any others to look it over.
I had a look at the buildkite check failure. Not sure if it is related to the changes in the PR?
In any case, I'll need someone to merge for me when the time is right.

https://github.com/llvm/llvm-project/pull/78011