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

[Florian Hahn via llvm-commits]

fhahn wrote:

@aeubanks thanks for the reproducer! Added it as test https://github.com/llvm/llvm-project/commit/52d29eb2874580f0fe96e5cbb96faffbbdc432a7 together with another test from X86 + ASan, both of which where related to truncates of widened inductions.

I am planing to recommit the change with a fix tomorrow

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