- support register expression for addresses, e.g.: $r15-1
- show whether addresses are in the minidump with "*"
- show decoded Smis with dd
- dd without arguments continues printing the next words

Change-Id: I1a6a4f9f470c25eee7da1381014252e723ef5f7c
Reviewed-on: https://chromium-review.googlesource.com/461900Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44192}