Ensure Sleep(...) isn't passed the value 0 on Windows

llvm-svn: 291342
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 72771139f1a92de7e3327aefff9de88111a1193a
diff --git a/src/thread.cpp b/src/thread.cpp
index 290e2ae..5ccf829 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -119,7 +119,7 @@
     {
 #if defined(_LIBCPP_WIN32API)
         milliseconds ms = duration_cast<milliseconds>(ns);
-        if (ns > duration_cast<nanoseconds>(ms))
+        if (ms.count() == 0 || ns > duration_cast<nanoseconds>(ms))
           ++ms;
         Sleep(ms.count());
 #else