[61/77] Use scalar_int_mode in the AArch64 port

[61/77] Use scalar_int_mode in the AArch64 port

This patch makes the AArch64 port use scalar_int_mode in various places.
Other ports won't need this kind of change; we only need it for AArch64
because of the variable-sized SVE modes.

The only change in functionality is in the rtx_costs handling
of CONST_INT.  If the caller doesn't supply a mode, we now pass
word_mode rather than VOIDmode to aarch64_internal_mov_immediate.
aarch64_movw_imm will therefore not now truncate large constants
in this situation.

2017-09-05  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* config/aarch64/aarch64-protos.h (aarch64_is_extend_from_extract):
	Take a scalar_int_mode instead of a machine_mode.
	(aarch64_mask_and_shift_for_ubfiz_p): Likewise.
	(aarch64_output_scalar_simd_mov_immediate): Likewise.
	(aarch64_simd_scalar_immediate_valid_for_move): Likewise.
	(aarch64_simd_attr_length_rglist): Delete.
	* config/aarch64/aarch64.c (aarch64_is_extend_from_extract): Take
	a scalar_int_mode instead of a machine_mode.
	(aarch64_add_offset): Likewise.
	(aarch64_internal_mov_immediate): Likewise
	(aarch64_add_constant_internal): Likewise.
	(aarch64_add_constant): Likewise.
	(aarch64_movw_imm): Likewise.
	(aarch64_rtx_arith_op_extract_p): Likewise.
	(aarch64_mask_and_shift_for_ubfiz_p): Likewise.
	(aarch64_simd_scalar_immediate_valid_for_move): Likewise.
	Remove assert that the mode isn't a vector.
	(aarch64_output_scalar_simd_mov_immediate): Likewise.
	(aarch64_expand_mov_immediate): Update calls after above changes.
	(aarch64_output_casesi): Use as_a <scalar_int_mode>.
	(aarch64_and_bitmask_imm): Check for scalar integer modes.
	(aarch64_move_imm): Likewise.
	(aarch64_can_const_movi_rtx_p): Likewise.
	(aarch64_strip_extend): Likewise.
	(aarch64_extr_rtx_p): Likewise.
	(aarch64_rtx_costs): Likewise, using wode_mode as the mode of
	a CONST_INT when the mode parameter is VOIDmode.
	(aarch64_float_const_rtx_p): Use scalar_int_mode for a temporary.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@251735 138bc75d-0d04-0410-961f-82ee72b054a4