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b644cd87a9
Previously we would check if we have a SwitchStmt, and apply diagnostics such as `checkExistentialTypes` to the CaseStmts individually. This however would have been missed for `catch` statements. The change to consistently call `performStmtDiagnostics` in closures fixed this for `do-catch`'s in closures, this commit fixes it for those outside of closures. Because this is source breaking, the existential diagnostic is downgraded to a warning until Swift 7 for catch statements specifically. While here, also apply the ambiguous where clause diagnostic to `catch` statements.