[4.0] SIL: Substitute DynamicSelfType out of context when synthesizing a capture parameter for it. #12112
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Explanation: The compiler would crash in situations where code captured
[weak self]
in a closure inside a class method returning dynamicSelf
.Scope of issue: Regression from Swift 3.x
Issue: rdar://problem/34563466.
Risk: Low. Small, targeted bug fix.
Testing: Swift CI, compatibility suite, project from Radar