Identify instructions as flow control inst.

Printed flag is indicates the instructions is a

FC_NONE        : not a flow control instruction.
FC_CALL        : CALL / CALL FAR
FC_RET         : RET / IRET / RETF
FC_SYS         : SYSCALL / SYSRET / SYSENTER / SYSEXIT
FC_UNC_BRANCH  : JMP / JMP FAR
FC_CND_BRANCH  : JCXZ / JO / JNO / JB / JAE / JZ / JNZ / JBE / JA /
                 JS / JNS / JP / JNP / JL / JGE / JLE / LOOP / LOOPZ /
                 LOOPNZ
FC_INT         : INT / INT1 / INT3 / INTO / UD2
FC_CMOV        : CMOVxx