[llvm] [RFC][LV] VPlan-based cost model (PR #67647)

[Renato Golin via llvm-commits]

rengolin wrote:

> There's no pre-defined set of test suites I think, but the ones I mentioned should cover a lot of ground.

Indeed, this isn't about performance versus each other, but making sure the cost model choices aren't different by looking at the debug traces while running over those programs. They are, so we're good.

https://github.com/llvm/llvm-project/pull/67647