Remove useless header

Author: clementval

flang/lib/Optimizer/CodeGen/CodeGen.cpp

@@ -23,7 +23,6 @@
 #include "flang/Optimizer/Support/InternalNames.h"
 #include "flang/Optimizer/Support/TypeCode.h"
 #include "flang/Optimizer/Support/Utils.h"
-#include "flang/Optimizer/Transforms/CUFCommon.h"
 #include "flang/Runtime/CUDA/descriptor.h"
 #include "flang/Runtime/CUDA/memory.h"
 #include "flang/Runtime/allocator-registry-consts.h"