Move sp/pc not changing check into Unwinder.

Remove this check from the DwarfSection class.

Rather than have every step function make the check, doing it at the
top level avoids having every function do the same check.

Bug: 68167269

Test: New unit tests, ran debuggerd -b on processes.
Change-Id: I23b7c799faaf26c93c1b72848df18c78de6c42fb