libbinder: ProcessState - force mark SM stability

We have a 'tryMarkCompilationStability' here which should never fail,
and is not error checked. Strengthening this check, since RPC
root/context services will have a similarly strengthened check.

Bug: 167966510
Test: boot
Change-Id: Ie82b06df2dcb7cd5c41fd17d12f406775b6013f7