8047186: jdk.net.Sockets throws InvocationTargetException instead of original runtime exceptions

Reviewed-by: michaelm
Contributed-by: artem.smotrakov@oracle.com

src/share/classes/jdk/net/Sockets.java

@@ -119,6 +119,8 @@ public class Sockets {
                 Throwable t = ((InvocationTargetException)e).getTargetException();
                 if (t instanceof IOException) {
                     throw (IOException)t;
+                } else if (t instanceof RuntimeException) {
+                    throw (RuntimeException)t;
                 }
             }
             throw new RuntimeException(e);
@@ -135,6 +137,8 @@ public class Sockets {
                 Throwable t = ((InvocationTargetException)e).getTargetException();
                 if (t instanceof IOException) {
                     throw (IOException)t;
+                } else if (t instanceof RuntimeException) {
+                    throw (RuntimeException)t;
                 }
             }
             throw new RuntimeException(e);