[VPlan] Mark recurrence recipes as not having side-effects.
Add support for FirstOrderRecurrenceSplice and VPFirstOrderRecurrencePHI recipes to mayHaveSideEffects. They both don't have side-effects.
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Add support for FirstOrderRecurrenceSplice and VPFirstOrderRecurrencePHI recipes to mayHaveSideEffects. They both don't have side-effects.
mentioned in commit 8f781b96