Histogram Counts of a 2d Matrix
Are you looking for a specific function to perform this task? Otherwise this could probably be done with a simple for loop.

Determine your unique rows using the function


  bins = unique(A, 'rows');


Then just loop through each row of A and count each instance of each bin you find in A. 

This is probably good enough if you dont care about how long the program runs (which still isnt long at all if your A matrix isn't ridiculously large), but keep in mind MATLAB doesn't "like" running loops.