use x86_type_E for x86_mode_E constants

mode_E is only 10 bytes wide but we should still use the 12byte wide
type_E for better alignment/consistency.

ir/be/amd64/amd64_transform.c

@@ -333,7 +333,7 @@ ir_entity *create_float_const_entity(ir_tarval *const tv)
 		return entity;
 
 	ir_mode *mode = get_tarval_mode(tv);
-	ir_type *type = get_type_for_mode(mode);
+	ir_type *type = mode == x86_mode_E ? x86_type_E : get_type_for_mode(mode);
 	ir_type *glob = get_glob_type();
 
 	entity = new_entity(glob, id_unique("C%u"), type);