This patch adds `ReduceOp::verifyRegions` to ensure that the number of
reduction regions equals the number of operands (`getReductions().size()
== getOperands().size()`).
Additionally, `ParallelOp::verify` is updated to gracefully handle cases
where the number of reduce operands differs from the initial values,
preventing verification logic crashes and relying on `ReduceOp` to
report structural inconsistencies.
Fixes: #118768
06aecdbebe