[OPENMP] Remove unused header files, NFC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@311908 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaOpenMP.cpp b/lib/Sema/SemaOpenMP.cpp
index 0473807..b283681 100644
--- a/lib/Sema/SemaOpenMP.cpp
+++ b/lib/Sema/SemaOpenMP.cpp
@@ -22,10 +22,7 @@
 #include "clang/AST/StmtCXX.h"
 #include "clang/AST/StmtOpenMP.h"
 #include "clang/AST/StmtVisitor.h"
-#include "clang/AST/TypeOrdering.h"
 #include "clang/Basic/OpenMPKinds.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Lex/Preprocessor.h"
 #include "clang/Sema/Initialization.h"
 #include "clang/Sema/Lookup.h"
 #include "clang/Sema/Scope.h"