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

[via llvm-commits]

https://github.com/ayalz commented:

"AdditionalBypassValue" is inaccurate - it serves as the additional bypass value only for the primary induction, other inductions use it to build their additional bypass value. Suggest to call it "MainVectorTripCount".

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