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

[Owen Pan via cfe-commits]

owenca wrote:

> Let's leave `None` alone and add `ExceptShortType`

I meant to add `ExceptShortType` instead of `AllowShortType`. Sorry I didn't realize that adding `AllowShortType` and making it to mean "not `None`" might work, in which case we don't need to add `ExceptShortType`.

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