<AWT Dev> VM shutdown upon X server termination

[Maxim Kartashev]

When the X server suddenly dies, Xlib would usually (or maybe always)
discover this as an I/O error. It will then call the function installed
with XSetIOErrorHandler() and expects that the function will not return
("the called routine should not return" from
https://tronche.com/gui/x/xlib/event-handling/protocol-errors/XSetIOErrorHandler.html).
If the handler returns, Xlib will simply call ::exit().

AWT installs awt_GraphicsEnv.c`xioerror_handler() as such a function and it
_does_ return. I was wondering if it would be prudent to properly terminate
VM from the handler (with JVM_Halt(), perhaps)? We are getting many reports
of JVM crashes on Linux that seem to be connected with the sudden
disappearance of the X server, but I wasn't able to reproduce this so can't
be sure that this is the issue we are facing.
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