This makes behavior when you've configured an SMP group of heterogeneous
targets a bit less weird. (You still shouldn't be doing that, since gdb
and who knows what else assumes that the targets in an SMP group are
homogeneous.)
Specifically, if you have a HiFive Unleashed board (where the first core
is fairly basic and the other 4 or more full-featured) this lets you
connect to all 5, and still have access to the FPU etc. on the higher
numbered cores.
Change-Id: I2e01f63f8753f78c29d7f414ea603e02bf0390e0
885260505a