[llvm] [GVN] Invalidate ICF cache when clearing the instructions (PR #68145)

[Shivam Gupta via llvm-commits]

xgupta wrote:

Thanks, @w2yehia, Can you also share how you got this test case for future purposes, I mean how do you run llvm-reduce for lto issue?

https://github.com/llvm/llvm-project/pull/68145