--- a/jdk/src/java.base/share/classes/java/lang/StringConcatHelper.java	Tue Feb 02 13:42:48 2016 -0800
+++ b/jdk/src/java.base/share/classes/java/lang/StringConcatHelper.java	Wed Feb 03 00:49:41 2016 +0300
@@ -342,4 +342,12 @@
         return new String(buf, coder);
     }
 
+    /**
+     * Provides the initial coder for the String.
+     * @return initial coder
+     */
+    static byte initialCoder() {
+        return String.COMPACT_STRINGS ? String.LATIN1 : String.UTF16;
+    }
+
 }