[llvm] [VPlan] First step towards VPlan cost modeling. (PR #92555)

[Harald van Dijk via llvm-commits]

hvdijk wrote:

> @hvdijk any chance you could share the IR that is causing the crash? (or point me to instructions how to build and reproduce this end-to-end with a custom clang if providing the IR isn't possible)

I gave the full `bug.ll` file in my comment along with the `opt` invocation to reproduce the crash.

https://github.com/llvm/llvm-project/pull/92555