ins_emit: get_iform_ids_table() optimized perf
ins_emit: get_iform_ids_table() optimized perf

(cherry picked from commit c7c5d6273535e176aca8b4268a9060b73c3e51b7)

intelxed/xed,intelxed/xed,intelxed/xed,intelxed/xed