8343925: [BACKOUT] JDK-8342650 Move getChars to DecimalDigits

Reviewed-by: jpai, alanb, liach

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

@@ -2648,6 +2648,14 @@ public final class System {
                 return str.coder();
             }
 
+            public int getCharsLatin1(long i, int index, byte[] buf) {
+                return StringLatin1.getChars(i, index, buf);
+            }
+
+            public int getCharsUTF16(long i, int index, byte[] buf) {
+                return StringUTF16.getChars(i, index, buf);
+            }
+
             public String join(String prefix, String suffix, String delimiter, String[] elements, int size) {
                 return String.join(prefix, suffix, delimiter, elements, size);
             }