Looks like some of the tests have been failing for a while on this bot:

**09:32:22**     Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Equality
**09:32:22**     Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Initializers
**09:32:22**     Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Bits
**09:32:22**     Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Iteration
**09:32:22**     Swift-Unit :: AST/./SwiftASTTests/IndexSubset.SupersetAndSubset
**09:32:22**     Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Insertion

Disabling these test cases in https://github.com/apple/swift/pull/27782

Thank you!