[patch][rfa] Add SYS_reconfig to libgloss/syscall.h

[Dave Brolley]

Hi,

I'd like approval to commit the attached patch which adds a syscall 
number to libgloss/syscall.h. The new syscall, SYS_reconfig, is used by 
SID for run time (simulation time) reconfiguration of the simulator, 
mainly for performance reasons. In particular, SID can be reconfigured 
on the fly in order to enable performance-sensitive options only while 
simulating code which is of particular interest. This allows less 
interesting code in the application to be simulated at optimal 
performance. This capability is already implemented and committed in SID.

One could also envision this being used by other simulators or perhaps 
even on some hardware targets.

Dave
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