8211804: Constant AO_UNUSED_MBZ uses left shift of negative value

Use unsigned shift.

Reviewed-by: phh, sgehwolf
Backport-of: 44f94ee8bc6c934be1f4435227a81e6072361110

Author: zzambers

jdk/src/share/native/com/sun/java/util/jar/pack/constants.h

@@ -223,7 +223,7 @@ enum {
     AO_HAVE_FIELD_FLAGS_HI    = 1<<10,
     AO_HAVE_METHOD_FLAGS_HI   = 1<<11,
     AO_HAVE_CODE_FLAGS_HI     = 1<<12,
-    AO_UNUSED_MBZ             = (-1)<<13, // options bits reserved for future use.
+    AO_UNUSED_MBZ             = (int)((~0U)<<13), // options bits reserved for future use.
 
 #define ARCHIVE_BIT_DO(F) \
          F(AO_HAVE_SPECIAL_FORMATS) \