SAN FRANCISCO, June 7 (Reuters) - * The Toronto Stock Exchange's S&P/TSX rose 8.85 points, or 0.05 percent, to 16,192.78 points. * The biggest contributor to the TSX gain was Suncor Energy , and energy was the top sector contributor, up 2.1 percent. * Leading the index were Birchcliff Energy Ltd, up 8.7 percent, Canadian Western Bank, up 8.5 percent, and Baytex Energy Corp , higher by 6.3 percent. * Lagging shares were Dollarama Inc, down 6.7 percent, Aphria Inc, down 5.7 percent, and NexGen Ene