This adds support for CAS_64{_VALUE}, CAS_PTR_2{_VALUE},
LOAD_64, STORE_64 and other primitives built on universal
CAS primitive.
Patch submitted by Olivier Houchard <cognet@FreeBSD>.
Besides implementing Thumb 2 supports, this fixes incorrect usage of
"cmp" where "cmpeq" was meant.
Patch submitted by Olivier Houchard <cognet@freebsd>.