test5z: adding memory zeroing test

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
test5m1: add test to move -1 to memory

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
test5l1: add test to repeatedly populate a single register with increasing values

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
test6zi: add load/and0/store test

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
test6zr: added load/and0reg/store test

Signed-off-by: Steven Noonan <steven@uplinklabs.net>