[clang] [clang-format] Allow array alignment on non-rectangular arrays (PR #143781)

[Ben Dunkin via cfe-commits]

bdunkin wrote:

Which existing bugs need to be fixed? I tried to not change the underlying code too much, but if a redesign is on the table, does that mean backwards compatibility is a lesser concern?

https://github.com/llvm/llvm-project/pull/143781