8334755: Asymptotically faster implementation of square root algorithm

src/java.base/share/classes/java/math/MutableBigInteger.java

@@ -547,7 +547,7 @@ public String toString() {
      * Like {@link #rightShift(int)} but {@code n} can be greater than the length of the number.
      */
     void safeRightShift(int n) {
-        if (n/32 >= intLen) {
+        if (n >= bitLength()) {
             reset();
         } else {
             rightShift(n);