SPARC: Missing sparc_v8 support

[kumarak]

The support of Sparc V8 architecture is missing and it only supports V9 mode. I am unable to decode the instruction ldtw (ldd) which is there in V8 but got deprecated in SPARC V9.

cstool -d sparc "\xc4\x1f\xbf\xf0"
ERROR: invalid assembly code

[aquynh]

we will fix this in v5: #1319