RFR: JDK-8244214: Change to VS2019 for building on Windows at Oracle

[Erik Joelsson]

Please review this change which changes the compiler version used to 
build for Windows at Oracle to Visual Studio 2019.

http://cr.openjdk.java.net/~erikj/8244214/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8244214

/Erik