cpu: Add HTM ThreadContext API

JIRA: https://gem5.atlassian.net/browse/GEM5-587

Change-Id: I9d60f69592c8072e70cef18787b5a4f2fc737a9d
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/30324
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
6 files changed