RFR(XS): 8150079: MSVC prior to VS 2013 doesn't know the 'va_copy' macro

[Volker Simonis]

Hi,

can I please have a review and a sponsor for the following small
change which fixes a build issue with VS2010:

http://cr.openjdk.java.net/~simonis/webrevs/2016/8150079/
https://bugs.openjdk.java.net/browse/JDK-8150079

Change "8146793: logStream::write re-formats string" introduced an
unconditional usage of the 'va_copy' macro which is not known to MSVC
versions prior to VS2013.

The HotSpot code base already uses the 'va_copy' macro in jni.cpp with
a guard against it being undefined.

This change will move the conditional guard and redefinition of
'va_copy' from jni.cpp to globalDefinitions_visCPP.hpp to make it
available in all HotSpot source files.


Thank you and best regards,
Volker