[llvm] [LLVM-Reduce] - Distinct Metadata Reduction (PR #96072)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Remove the --abort-on-invalid-reduction flag

We should only ever be adding uses of it, not removing it. We should always be trying to avoid invalid IR 

https://github.com/llvm/llvm-project/pull/96072