be: Factor out code to set the va_list type to a void pointer.

ir/be/bevarargs.c

@@ -66,3 +66,8 @@ void be_default_lower_va_arg_compound_val(ir_node *const node)
 {
 	be_default_lower_va_arg(node, false);
 }
+
+void be_set_va_list_type_pointer(backend_params *const p)
+{
+	p->vararg.va_list_type = new_type_pointer(get_type_for_mode(mode_ANY));
+}

ir/be/bevarargs.h

@@ -12,6 +12,7 @@
 #ifndef FIRM_BE_BEVARARGS_H
 #define FIRM_BE_BEVARARGS_H
 
+#include "be.h"
 #include "firm_types.h"
 
 /**
@@ -36,4 +37,6 @@ void be_default_lower_va_arg_compound_ptr(ir_node *node);
  */
 void be_default_lower_va_arg_compound_val(ir_node *node);
 
+void be_set_va_list_type_pointer(backend_params *p);
+
 #endif

ir/be/ia32/ia32_bearch.c

@@ -1388,9 +1388,7 @@ static void ia32_init(void)
 	ia32_mode_float32 = new_float_mode("fp32", irma_ieee754, 8, 23,
 	                                   ir_overflow_indefinite);
 
-	// va_list is a void pointer
-	ir_type *type_va_list = new_type_pointer(get_type_for_mode(mode_ANY));
-	ia32_backend_params.vararg.va_list_type = type_va_list;
+	be_set_va_list_type_pointer(&ia32_backend_params);
 
 	if (ia32_cg_config.use_sse2 || ia32_cg_config.use_softfloat) {
 		ia32_backend_params.mode_float_arithmetic = NULL;

ir/be/sparc/sparc_bearch.c

@@ -552,9 +552,7 @@ static const backend_params *sparc_get_backend_params(void)
 		},
 	};
 
-	ir_type *type_va_list
-		= new_type_pointer(get_type_for_mode(mode_ANY));
-	p.vararg.va_list_type = type_va_list;
+	be_set_va_list_type_pointer(&p);
 
 	sparc_mode_Q
 		= new_float_mode("Q", irma_ieee754, 15, 112, ir_overflow_min_max);