Add include <variant> in a place that I missed.

gottesmm · gottesmm · commit a2d1adfcd0fb · 2024-03-18T14:50:03.000-07:00
diff --git a/include/swift/SILOptimizer/Utils/PartitionUtils.h b/include/swift/SILOptimizer/Utils/PartitionUtils.h
@@ -21,6 +21,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Debug.h"
 #include <algorithm>
+#include <variant>
 
 #define DEBUG_TYPE "transfer-non-sendable"
 
