Change another mask operation to a bit shift.

commons-rng-examples/examples-jmh/src/main/java/org/apache/commons/rng/examples/jmh/sampling/distribution/ZigguratSamplerPerformance.java

@@ -1656,7 +1656,7 @@ private double edgeSample(long xx) {
                         break;
                     }
                     // uDiff < MAX_IE (upper-right triangle) or rejected as above the curve
-                    u1 = randomInt63();
+                    u1 = nextLong() >>> 1;
                 }
             } else if (j < J_INFLECTION) {
                 if (j == 0) {