natDouble.java (doubleToLongBits): ensure that all NaNs are always converted to the same long value.

1999-04-14  Andrew Haley  <aph@cygnus.com>
        * java/lang/natDouble.java (doubleToLongBits): ensure that all
        NaNs are always converted to the same long value.
        * java/lang/natFloat.java (floatToIntBits): ditto, but for float
        converted to int.

From-SVN: r26439