[flang][cuda] Fix buildbot after #152418 (#152437)

Author: clementval

flang/lib/Lower/CUDA.cpp

@@ -11,6 +11,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "flang/Lower/CUDA.h"
+#include "flang/Lower/AbstractConverter.h"
+#include "flang/Optimizer/Builder/Todo.h"
 
 #define DEBUG_TYPE "flang-lower-cuda"