[Threading][test] disable threaded lit tests under threading_none

Author: kateinoigakukun

test/Concurrency/async_task_base_priority.swift

@@ -8,6 +8,7 @@
 // REQUIRES: concurrency_runtime
 // UNSUPPORTED: back_deployment_runtime
 // UNSUPPORTED: back_deploy_concurrency
+// UNSUPPORTED: threading_none
 
 import StdlibUnittest
 import Dispatch

test/Runtime/associated_witness_concurrency.swift

@@ -3,6 +3,7 @@
 // RUN: %target-run %t
 // REQUIRES: libdispatch
 // REQUIRES: executable_test
+// UNSUPPORTED: threading_none
 
 import Dispatch
 

test/Sanitizers/tsan/mainactor.swift

@@ -5,6 +5,7 @@
 // REQUIRES: libdispatch
 // REQUIRES: tsan_runtime
 // UNSUPPORTED: use_os_stdlib
+// UNSUPPORTED: threading_none
 
 import Dispatch
 

test/Sanitizers/tsan/tsan.swift

@@ -5,6 +5,7 @@
 // REQUIRES: tsan_runtime
 // UNSUPPORTED: OS=tvos
 // UNSUPPORTED: CPU=powerpc64le
+// UNSUPPORTED: threading_none
 
 // FIXME: This should be covered by "tsan_runtime"; older versions of Apple OSs
 // don't support TSan.

validation-test/Runtime/ConcurrentMetadata.swift

@@ -1,6 +1,7 @@
 // RUN: %target-run-simple-swift
 // REQUIRES: executable_test
 // UNSUPPORTED: single_threaded_runtime
+// UNSUPPORTED: threading_none
 
 // Exercise the metadata cache from multiple threads to shake out any
 // concurrency bugs.