[flang-commits] [flang] [Flang] Add fallthrough annotations in visit.h (PR #90014)

[Alexander Shaposhnikov via flang-commits]

alexander-shaposhnikov wrote:

p.s. i think we probably no longer need to use a macro since LLVM now requires c++17 and [[fallthrough]] may be used directly.

https://github.com/llvm/llvm-project/pull/90014