[Test] Temporarily disable Runtime/async_taskgroup_throw_rethrow.swift

rdar://problem/73154198

Author: nate-chandler

test/Concurrency/Runtime/async_taskgroup_throw_rethrow.swift

@@ -4,6 +4,9 @@
 // REQUIRES: OS=macosx
 // REQUIRES: CPU=x86_64
 
+// Remove with rdar://problem/73154198
+// UNSUPPORTED: asan
+
 import Dispatch
 
 struct Boom: Error {}