[12] RFR 8021322: [Fmt-Ch] Implementation of ChoiceFormat math methods should delegate to java.lang.Math methods

[Nishit Jain]

Hi,

Please review the fix for JDK-8021322. CSR for the spec changes has been 
approved.

Bug: https://bugs.openjdk.java.net/browse/JDK-8021322
Webrev: http://cr.openjdk.java.net/~nishjain/8021322/webrev.01/
CSR: https://bugs.openjdk.java.net/browse/JDK-8208071

Fix: Changed the ChoiceFormat's nextDouble(double), 
previousDouble(double), nextDouble(double, boolean) APIs implementation 
to delegate the execution to the equivalent Math APIs

Regards,
Nishit Jain