8282573: ByteBufferTest.java: replace endless recursion with RuntimeException in void ck(double x, double y)

Reviewed-by: psandoz, thartmann

Author: eme64

test/hotspot/jtreg/compiler/intrinsics/unsafe/ByteBufferTest.java

@@ -216,8 +216,10 @@ void ck(long x, long y) {
     }
 
     void ck(double x, double y) {
-        if (x == x && y == y && x != y) {
-            ck(x, y);
+        if (x != y) {
+            throw new RuntimeException(" x = " + Double.toString(x) + ", y = " + Double.toString(y)
+                                    + " (x = " + Long.toHexString(Double.doubleToRawLongBits(x))
+                                    + ", y = " + Long.toHexString(Double.doubleToRawLongBits(y)) + ")");
         }
     }