Revert "Disable Test That Trips Coro Split Assert on Linux"

This reverts commit 93569a2.

Author: CodaFi

test/Concurrency/Runtime/async_properties_actor.swift

@@ -3,7 +3,6 @@
 // REQUIRES: executable_test
 // REQUIRES: concurrency
 // REQUIRES: libdispatch
-// REQUIRES: rdar75104136
 
 @propertyWrapper
 struct SuccessTracker {
@@ -171,4 +170,4 @@ var expectedResult : Bool {
         // CHECK: done all testing
         print("done all testing")
     }
-}
+}