Replace checks of "GET_MODE_CLASS (...) == MODE_INT" with
"is_int_mode (..., &var)", in cases where it becomes useful
to refer to the mode as a scalar_int_mode.

2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* machmode.h (is_int_mode): New fuction.
	* combine.c (find_split_point): Use it.
	(combine_simplify_rtx): Likewise.
	(simplify_if_then_else): Likewise.
	(simplify_set): Likewise.
	(simplify_shift_const_1): Likewise.
	(simplify_comparison): Likewise.
	* config/aarch64/aarch64.c (aarch64_rtx_costs): Likewise.
	* cse.c (notreg_cost): Likewise.
	(cse_insn): Likewise.
	* cselib.c (cselib_lookup_1): Likewise.
	* dojump.c (do_jump_1): Likewise.
	(do_compare_rtx_and_jump): Likewise.
	* dse.c (get_call_args): Likewise.
	* dwarf2out.c (rtl_for_decl_init): Likewise.
	(native_encode_initializer): Likewise.
	* expmed.c (emit_store_flag_1): Likewise.
	(emit_store_flag): Likewise.
	* expr.c (convert_modes): Likewise.
	(store_field): Likewise.
	(expand_expr_real_1): Likewise.
	* fold-const.c (fold_read_from_constant_string): Likewise.
	* gimple-ssa-sprintf.c (get_format_string): Likewise.
	* optabs-libfuncs.c (gen_int_libfunc): Likewise.
	* optabs.c (expand_binop): Likewise.
	(expand_unop): Likewise.
	(expand_abs_nojump): Likewise.
	(expand_one_cmpl_abs_nojump): Likewise.
	* simplify-rtx.c (mode_signbit_p): Likewise.
	(val_signbit_p): Likewise.
	(val_signbit_known_set_p): Likewise.
	(val_signbit_known_clear_p): Likewise.
	(simplify_relational_operation_1): Likewise.
	* tree.c (vector_type_mode): Likewise.

gcc/go/
	* go-lang.c (go_langhook_type_for_mode): Use is_int_mode.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r251472