replaced idiv1616(x, L_SUBFR) with shr(x, L_SUBFR_LOG2), which is equivalen,...

replaced idiv1616(x, L_SUBFR) with shr(x, L_SUBFR_LOG2), which is equivalen, in ib_com/bits_alloc_fx.c, dec_ace_fx.c, /dec_amr_wb_fx.c, dec_gen_voic_fx.c, dec_tran_fx.c, dec_uv_fx.c