Add unit tests for the functions and classes in debug.hh. breakpoint() is not being tested. Change-Id: I1ae7318a043aa9dc479d4f970c1fd6c9946f4357 Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/38710 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>