Merge pull request #39355 from apple/fix-8c5d383aab38be2ea91f808b47f9064fec9f94fe

Concurrency: add Windows support to `SWIFT_TASK_PRINTF_DEBUG`

Author: shahmishal

stdlib/public/Concurrency/TaskPrivate.h

@@ -27,6 +27,16 @@
 
 #include "../runtime/StackAllocator.h"
 
+#if HAVE_PTHREAD_H
+#include <pthread.h>
+#endif
+#if defined(_WIN32)
+#define WIN32_LEAN_AND_MEAN
+#define VC_EXTRA_LEAN
+#define NOMINMAX
+#include <Windows.h>
+#endif
+
 namespace swift {
 
 // Uncomment to enable helpful debug spew to stderr