The ornamental design for a armprotector for blockingsunlight while driving, as shown and described.
FIG. 1 is a front elevated view of an arm protector for blocking sunlight while driving showing my new design, the areas in phantom being for illustrative purposes only and forming no portion of the claimed invention;
FIG. 2 is a rear elevated view of the arm protector for blocking sunlight while driving;
FIG. 3 is a right side elevated view of the arm protector for blocking sunlight while driving;
FIG. 4 is a left side elevated view of the arm protector for blocking sunlight while driving;
FIG. 5 is a top plan view of the arm protector for blocking sunlight while driving; and,
FIG. 6 is a bottom plan view of the arm protector for blocking sunlight while driving.