Note that we don't have to worry about CallstackProfileData[Id] default-constructing the value side of a new map entry. If that happens, AccessHistogramSize > 0 wouldn't be true, and the new map entry gets deleted right away.
Note that we don't have to worry about CallstackProfileData[Id] default-constructing the value side of a new map entry. If that happens, AccessHistogramSize > 0 wouldn't be true, and the new map entry gets deleted right away.