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

[Owen Pan via llvm-commits]

owenca wrote:

> What would change if the default was kept at `None`? I don't see it.

See https://github.com/llvm/llvm-project/pull/78011#issuecomment-1913052884.

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