8338595: Add more linesize for MIME decoder in macro bench test Base64Decode

Reviewed-by: rehn

Author: Hamlin Li

test/micro/org/openjdk/bench/java/util/Base64Decode.java

@@ -50,7 +50,7 @@ public class Base64Decode {
             "112", "512", "1000", "20000", "50000"})
     private int maxNumBytes;
 
-    @Param({"4"})
+    @Param({"4", "32", "76", "128"})
     private int lineSize;
 
     private byte[] lineSeparator = {'\r', '\n'};