[llvm] [VPlan] Fix VPTypeAnalysis cache clobbering in EVL transform (PR #120252)

[Luke Lau via llvm-commits]

lukel97 wrote:

> How about alternative approach - actual deletion of the dead recipes after the transformation?

Yeah I had considered that but I thought recursivelyDeleteDeadRecipes might have made it a bit tricky since it erases recipes in flight. But I don't see why we couldn't also just run that once at the end instead of after each header mask. I'll give that a try

https://github.com/llvm/llvm-project/pull/120252