[LV] Drop incorrect inbounds for reverse vector pointer when folding tail (#120730)

When folding the tail, we may compute an address that we don't in the
original scalar loop and it may not be inbo

[LV] Drop incorrect inbounds for reverse vector pointer when folding tail (#120730)

When folding the tail, we may compute an address that we don't in the
original scalar loop and it may not be inbounds. Drop Inbounds in that
case.

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[Vectorizer] precommit test for miscompilation (#120731)

we generate GEPs that are out of bounds but mark them as "inbound"