This adds the definition of the Target Address Register (TAR) and the following instructions that are associated with it. * Move To Target Address Register (mttar) * Move From Target Address Register (mftar) * Branch Conditional to Branch Target Address Register (bctar[l]) Change-Id: I30f54ebd38b503fb6c9ba9dd74d00ccbbc0f8318 Signed-off-by: Sandipan Das <sandipan@linux.ibm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40889 Reviewed-by: Boris Shingarov <shingarov@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>