x86: support 0x82 opcode for Arithmetic instructions
x86: support some tricky instructions

- NOP instructions with encoding 0f {19-1f}. see http://code.google.com/p/corkami/wiki/x86oddities?show=content
- TEST instructions with opcode 0xF6, 0xF7 (MRM1m)
- Fix arithmetic instructions with opcode 0x82: only available in Non64bit mode