The ornamental design for a golfclubheadcover, as shown and described.
FIG. 1 shows a first side view for a golf club head cover showing my new design;
FIG. 2 shows a front view thereof;
FIG. 3 shows a rear view thereof;
FIG. 4 show a second side view thereof;
FIG. 5 shows a front view thereof shown in use; and,
FIG. 6 shows a rear view thereof shown in use.
The golf bag and golf club depicted by broken lines in FIGS. 5 and 6 have been shown for the purpose of illustrating environment that forms no part of the claimed design.