[foreign] RFR 8215486: Check for no arrays in header functions broken after SystemABI refactoring

[Maurizio Cimadamore]

Hi,
this issue has been discovered by Jorn (thanks!) when working on Windows 
port. A bug has been introduced after the SystemABI work: not all upcall 
handlers/invokers check for absence of arrays in native function signatures.

The fix is to move the check closer to SysVABI::upcall/downcall entry 
points, so that it will be ran no matter the concrete invoker/upcall 
handler being used.

I've also added another run to an existing test (ArrayInFunctionsTest) 
to make sure it's run with both invokers.

Webrev:
https://cr.openjdk.java.net/~mcimadamore/panama/8215486/

Cheers
Maurizio