Dependence analysis in the vectorizer assumes that all references
take part in vectorization - which is of course the case for
loop-based vectorization. For BB vectorization unrelated DRs
can be inbetween vectorized stmts though. The original fix
properly verified that when accounting DDRs that
This fixes PR59374, dependence analysis during BB SLP handles cases
that depend on the order of vectorized stmt generation in which case
it ignores WAR dependencies. But that of course only applies to
references that participate in the vectorization.
Bootstrapped and tested on x86_64-unknown-lin
