Remove unused code.

h2/src/main/org/h2/util/CacheLRU.java

@@ -54,7 +54,6 @@ public class CacheLRU implements Cache {
         this.setMaxMemory(maxMemoryKb);
         this.len = MathUtils.nextPowerOf2(maxMemory / 64);
         this.mask = len - 1;
-        MathUtils.checkPowerOf2(len);
         clear();
     }
 
@@ -100,7 +99,7 @@ public class CacheLRU implements Cache {
             int pos = rec.getPos();
             CacheObject old = find(pos);
             if (old != null) {
-                DbException.throwInternalError("try to add a record twice pos:" + pos);
+                DbException.throwInternalError("try to add a record twice at pos " + pos);
             }
         }
         int index = rec.getPos() & mask;

h2/src/main/org/h2/util/MathUtils.java

@@ -221,18 +221,6 @@ public class MathUtils {
         return (x + blockSizePowerOf2 - 1) & (-blockSizePowerOf2);
     }
 
-    /**
-     * Check if a value is a power of two.
-     *
-     * @param len the value to check
-     * @throws RuntimeException if it is not a power of two
-     */
-    public static void checkPowerOf2(int len) {
-        if ((len & (len - 1)) != 0 && len > 0) {
-            DbException.throwInternalError("not a power of 2: " + len);
-        }
-    }
-
     /**
      * Get the value that is equal or higher than this value, and that is a
      * power of two.