[flang] remove bogus header include from llvm#164988

Author: jeanPerier

flang/lib/Optimizer/Builder/HLFIRTools.cpp

@@ -18,7 +18,6 @@
 #include "flang/Optimizer/Builder/Todo.h"
 #include "flang/Optimizer/Dialect/FIRType.h"
 #include "flang/Optimizer/HLFIR/HLFIROps.h"
-#include "flang/Optimizer/OpenMP/Passes.h"
 #include "mlir/IR/IRMapping.h"
 #include "mlir/Support/LLVM.h"
 #include "llvm/ADT/TypeSwitch.h"