Stamps the left-hand-side values with the corresponding right hand side.
The rightKeyIndices are parallel to the stamp values in rightStamps; and used to compute a new chunk of redirections
parallel to leftStamps.
Parameters:
leftStamps - the input lhs stamp values
rightStamps - the input rhs stamp values
rightKeyIndices - the input rhs stamp indices
leftRedirections - the resulting redirections from the stamping operation