CREATE TABLE table_11673 ("Race" TEXT, "Date" TEXT, "Location" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Race Winner" TEXT, "Constructor" TEXT, "Report" TEXT)

What Canadian Grand Prix race winner had Didier Pironi in Pole Position?
SELECT "Race Winner" FROM table_11673 WHERE "Pole Position" = 'didier pironi' AND "Race" = 'canadian grand prix'
SELECT "Race Winner" FROM "table_11673" WHERE "Pole Position" = 'didier pironi' AND "Race" = 'canadian grand prix'