x86 ( 32bit) is the only architecture that uses Fast trap vector offset
( fast_trap_idx ). This makes sure that x86 is the only architecture to
use this variable.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>

Jerone Young
Open Virtualization
IBM Linux Technology Center
jyoung5@us.ibm.com
512-838-1157 (T/L: 678-1157)