Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/asan/TestCases/Windows/beginthreadex.cc

@@ -0,0 +1,21 @@
+// RUN: %clang_cl_asan -O0 %s -Fe%t
+// RUN: %run %t
+
+#include <windows.h>
+#include <process.h>
+
+unsigned WINAPI thread_proc(void *) {
+  volatile char stack_buffer[42];
+  for (int i = 0; i < sizeof(stack_buffer); ++i)
+    stack_buffer[i] = 42;
+  return 0;
+}
+
+int main() {
+  HANDLE thr = (HANDLE)_beginthreadex(NULL, 0, thread_proc, NULL, 0, NULL);
+  if (thr == 0)
+    return 1;
+  if (WAIT_OBJECT_0 != WaitForSingleObject(thr, INFINITE))
+    return 2;
+  CloseHandle(thr);
+}