[flang-commits] [flang] [llvm] [mlir] [mlir] Mark `isa/dyn_cast/cast/...` member functions deprecated. (PR #90413)

[via flang-commits]

dyung wrote:

> Note that this change previously broke a [Windows build](https://lab.llvm.org/buildbot/#/builders/216/builds/38157).
> 
> @dyung, could you please advise how to test this change so I don't break it again?

I don't know if this change is any different from what you submitted, but when I applied the patches locally, our Windows build failed the same way as before.

https://github.com/llvm/llvm-project/pull/90413