python: Add simulator instantiation checks

Check that m5.instantiate() has been called before m5.simulate() and
that m5.instantiate() is only called once.

Change-Id: Iced129cfd3d09564e2ef619eba829fd294c8a6ac
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53923
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed