The ornamental design for a toolholder, as shown and described.
FIG. 1 is a front, left side, bottom isometric view of my tool holder;
FIG. 2 is a front view of the tool holder of FIG. 1;
FIG. 3 is a rear view of the tool holder of FIG. 1;
FIG. 4 is a left side view of the tool holder of FIG. 1;
FIG. 5 is a right side view of the tool holder of FIG. 1;
FIG. 6 is a top view of the tool holder of FIG. 1; and,
FIG. 7 is a bottom view of the tool holder of FIG. 1.
The broken lines visible in FIGS. 1, 2 and 6 are for the purpose of showing visible portions of a pair of internal ribs that form no part of the claimed design.