JDK 9 RFR of JDK-8138823: Correct bug in port of fdlibm hypot to Java

[joe darcy]

Hello,

Please review the changes for

     JDK-8138823: Correct bug in port of fdlibm hypot to Java
     http://cr.openjdk.java.net/~darcy/8138823.0/

The change to java/lang/FdLibm.java is to correct a problem analogous to 
one recently corrected in the port of the pow method.

The testing includes a few improvements, including the addition of 
FdlibmTranslit.java to host transliteration ports of the fdlibm methods. 
That is, Java ports of the code that are as close to the C versions as 
possible while still being readable. For the code used for 
java.lang.StrictMath, it is desirable for the code to be faster and to 
be closer to idiomatic Java.

Thanks,

-Joe