[region-isolation]fix crash due to missing VectorBaseAddrInst case #81591
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Resolves #81534
It seems we are missing the case for
VectorBaseAddrInst.VectorBaseAddrInstis statically defined asLookThrough.swift/lib/SILOptimizer/Analysis/RegionAnalysis.cpp
Line 3414 in d985bf6
Regarding tests, similar problems could arise when new
LookThroughinstructions are added in the future. To prevent this, we should consider finding a way to ensure allLookThroughinstructions are properly handled inisStaticallyLookThroughInst. What do you think?