i386.md (length_immediate): Use gcc_assert or gcc_unreachable, as appropriate.

	* config/i386/i386.md (length_immediate): Use gcc_assert or
	gcc_unreachable, as appropriate.
	(*movsi_1, *movqi_1, reload_outqi, *movdi_1_rex64, *pushsf,
	*pushsf_rex64, *truncxfsf2_mixed, *truncxfsf2_i387,
	*truncxfdf2_mixed, *truncxfdf2_i387, *adddi_1_rex64,
	*adddi_2_rex64, *adddi_3_rex64, *adddi_4_rex64, *adddi_5_rex64,
	*addsi_1, addsi_1_zext, *addsi_2, *addsi_2_zext, *addsi_3,
	*addsi_3_zext, *addsi_4, *addsi_5, *addhi_1_lea, *addhi_1,
	*addhi_2, *addhi_3, *addhi_4, *addhi_5, *addqi_1_lea, *addqi_1,
	*addqi_1_slp, *addqi_2, *addqi_3, *addqi_4, *addqi_5, addqi_ext_1,
	*addqi_ext_1_rex64, *anddi_1_rex64, *andsi_1, *andhi_1,
	*ashldi3_1_rex64, *ashldi3_cmp_rex64, *ashlsi3_1, *ashlsi3_1_zext,
	*ashlsi3_cmp, *ashlsi3_cmp_zext, *ashlhi3_1_lea, *ashlhi3_1,
	*ashlhi3_cmp, *ashlqi3_1_lea, *ashlqi3_1, *ashlqi3_cmp,
	pro_epilogue_adjust_stack_1, pro_epilogue_adjust_stack_rex64,
	pro_epilogue_adjust_stack_rex64_2, prefetch, *prefetch_sse,
	*prefetch_sse_rex): Likewise.
	* config/i386/predicates.md (x86_64_immediate_operand,
	x86_64_zext_immediate_operand, symbolic_operand,
	no_seg_address_operand, aligned_operand,
	memory_displacement_operand): Likewise.
	* config/i386/sse.md (*mov<mode>_internal,
	*movv2df_internal): Likewise.

From-SVN: r98549