fix include after rebase

Author: ergawy

flang/lib/Lower/OpenMP/Atomic.cpp

@@ -7,11 +7,11 @@
 //===----------------------------------------------------------------------===//
 
 #include "Atomic.h"
-#include "Clauses.h"
 #include "flang/Evaluate/expression.h"
 #include "flang/Evaluate/fold.h"
 #include "flang/Evaluate/tools.h"
 #include "flang/Lower/AbstractConverter.h"
+#include "flang/Lower/OpenMP/Clauses.h"
 #include "flang/Lower/PFTBuilder.h"
 #include "flang/Lower/StatementContext.h"
 #include "flang/Lower/SymbolMap.h"