RFR: JDK-8248548 Use DISABLED_WARNINGS for globally disabled warnings on Visual Studio in Hotspot

Tue Jun 30 10:08:50 UTC 2020

Currently hotspot/share/utilities/globalDefinitions_visCPP.hpp contains 
a lot of #pragma warning( disable : ...).

All these globally disabled warnings should move to the make files instead.

I also cleaned out some versions checks that are no longer relevant for 
the range of supported versions of Microsoft Visual Studio.

Bug: https://bugs.openjdk.java.net/browse/JDK-8248548
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8248548-use-DISABLED_WARNINGS_microsoft-for-hotspot/webrev.01

/Magnus