tests: disable Concurrency.throwing

compnerd · compnerd · commit 1c8149b56419 · 2021-09-27T11:01:19.000-07:00
The rebranch is exposing a UaF/stack corruption, disable this for the
time being.
diff --git a/test/Concurrency/throwing.swift b/test/Concurrency/throwing.swift
@@ -6,6 +6,9 @@
 // REQUIRES: concurrency_runtime
 // UNSUPPORTED: back_deployment_runtime
 
+// SR-15252
+// XFAIL: OS=windows-msvc
+
 import _Concurrency
 import StdlibUnittest
 
