[VPlan] Compute induction end values in VPlan. (#112145)

Use createDerivedIV to compute IV end values directly in VPlan, instead
of creating them up-front.

This allows updating IV users outside

[VPlan] Compute induction end values in VPlan. (#112145)

Use createDerivedIV to compute IV end values directly in VPlan, instead
of creating them up-front.

This allows updating IV users outside the loop as follow-up.

Depends on https://github.com/llvm/llvm-project/pull/110004 and
https://github.com/llvm/llvm-project/pull/109975.

PR: https://github.com/llvm/llvm-project/pull/112145

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[LV][NFC] Add test cases for FindLastIV reduction idiom. (#118519)

Pre-commit for #67812