Merge pull request swiftlang#66219 from swiftwasm/pr-0a78621ff9f12f4599ec769c2d1c0bb3e4197f41

[DiscardingTG] Fix runtime signature mismatch for statically known `-> Void` closure

Author: kateinoigakukun

stdlib/public/Concurrency/Task.cpp

@@ -832,7 +832,7 @@ static AsyncTaskAndContext swift_task_create_commonImpl(
   //  the async context to get at the parameters.
   //  See e.g. FutureAsyncContextPrefix.
 
-  if (!futureResultType) {
+  if (!futureResultType || taskCreateFlags.isDiscardingTask()) {
     auto asyncContextPrefix = reinterpret_cast<AsyncContextPrefix *>(
         reinterpret_cast<char *>(allocation) + headerSize -
         sizeof(AsyncContextPrefix));