Mel Chen 86916ff0f0
[LV] Fix gap mask requirement for interleaved access (#151105)
When interleaved stores contain gaps, a mask is required to skip the
gaps, regardless of whether scalar epilogues are allowed.
This patch corrects the condition under which a gap mask is needed,
ensuring consistency between the legacy and VPlan-based cost models and
avoiding assertion failures.

Related #149981
2025-08-01 14:24:30 +08:00
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