8356021: Use Double::hashCode in java.util.Locale::hashCode

Reviewed-by: rriggs, liach

Author: wenshao

src/java.base/share/classes/java/util/Locale.java

@@ -3497,8 +3497,7 @@ public int hashCode() {
             if (h == 0) {
                 h = 17;
                 h = 37*h + range.hashCode();
-                long bitsWeight = Double.doubleToLongBits(weight);
-                h = 37*h + (int)(bitsWeight ^ (bitsWeight >>> 32));
+                h = 37*h + Double.hashCode(weight);
                 if (h != 0) {
                     hash = h;
                 }