llvm-project

72da62be - Reapply "[Flang] Add fallthrough annotations in visit.h (#90014)"

Reapply "[Flang] Add fallthrough annotations in visit.h (#90014)" Use [[fallthrough]] directly (similarly to https://reviews.llvm.org/D131346). This recommits eb05a2e89dccec734625aa336b553197b75f2340.