[llvm] [VPlan] Update scalar induction resume values in VPlan. (PR #110577)

[Florian Hahn via llvm-commits]

fhahn wrote:

> Are there still more bypass values created than needed, leading to test changes?

(responding here as the comment button disappeared...)

In some cases we create an additional resume phi, but most renames are due to the resume phis now being created after generating code for the main vector loop instead of creating them upfront (and thus bumping the name counter earlier before this patch)

https://github.com/llvm/llvm-project/pull/110577