Support argfiles in kotlin compiler

Using '-Xargfile=path/to/argfile' will substitute
that argument with the content of argfile.

See KT-24472

compiler/preloader/src/org/jetbrains/kotlin/preloading/Preloader.java

@@ -266,10 +266,14 @@ public class Preloader {
         }
     }
 
-    private static class PreloaderException extends RuntimeException {
+    public static class PreloaderException extends RuntimeException {
         public PreloaderException(String message) {
             super(message);
         }
+
+        public PreloaderException(String message, Throwable cause) {
+            super(message, cause);
+        }
     }
 
     private static class Handler extends ClassHandler {