[6.0] Sema: Fix incorrect use of STL iterator in associated type inference #74830
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6.0 cherry-pick of #74800
Description: Crash-on-invalid from forgetting to compare STL iterator with
end()
.Origination: Regression in Swift 6 associated type inference implementation.
Risk: Very low, because the old behavior was UB.
Radar: rdar://problem/127575477.