Introduce a virtual output() method which prints the current PCState to the given output stream, and define an overload for << to use that method. This will make it possible to print a PCState without knowing what the actual type is. Change-Id: I663619b168c0b2b90c148b45ae16d77f03934e5b Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52039 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>