8300493: Use ArraysSupport.vectorizedHashCode in j.u.zip.ZipCoder

Reviewed-by: alanb, lancea

src/java.base/share/classes/java/lang/System.java

@@ -2461,6 +2461,9 @@ public final class System {
                 return ModuleLayer.layers(loader);
             }
 
+            public int countPositives(byte[] bytes, int offset, int length) {
+                return StringCoding.countPositives(bytes, offset, length);
+            }
             public String newStringNoRepl(byte[] bytes, Charset cs) throws CharacterCodingException  {
                 return String.newStringNoRepl(bytes, cs);
             }