Disable Concurrency/isolated_parameters.swift

Author: meg-gupta

test/Concurrency/isolated_parameters.swift

@@ -4,6 +4,8 @@
 // REQUIRES: concurrency
 // REQUIRES: swift_swift_parser
 
+// REQUIRES: rdar126006489
+
 @available(SwiftStdlib 5.1, *)
 actor A {
   func f() { } // expected-note 5{{calls to instance method 'f()' from outside of its actor context are implicitly asynchronous}}