Enable the ReservedStackTests on Windows

Author: swesonga

test/hotspot/jtreg/runtime/ReservedStack/ReservedStackTest.java

@@ -241,6 +241,7 @@ private static boolean isAlwaysSupportedPlatform() {
             (Platform.isLinux() &&
              (Platform.isPPC() || Platform.isS390x() || Platform.isX64() ||
               Platform.isX86() || Platform.isAArch64() || Platform.isRISCV64())) ||
+            Platform.isWindows() ||
             Platform.isOSX();
     }