diff --git a/clang/include/clang/AST/OpenMPClause.h b/clang/include/clang/AST/OpenMPClause.h
index 3fd1b6d300803..3ecc1d40fafc6 100644
--- a/clang/include/clang/AST/OpenMPClause.h
+++ b/clang/include/clang/AST/OpenMPClause.h
@@ -32,6 +32,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/iterator.h"
 #include "llvm/ADT/iterator_range.h"
+#include "llvm/Frontend/OpenMP/OMPAssume.h"
 #include "llvm/Frontend/OpenMP/OMPConstants.h"
 #include "llvm/Frontend/OpenMP/OMPContext.h"
 #include "llvm/Support/Casting.h"
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 300b022d83b99..7c783ef0b02b2 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -23,6 +23,7 @@
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/UniqueVector.h"
+#include "llvm/Frontend/OpenMP/OMPAssume.h"
 #include "llvm/Frontend/OpenMP/OMPContext.h"
 
 using namespace clang;
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index ba0481874577e..61e6d4995b9bc 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -36,6 +36,7 @@
 #include "llvm/ADT/PointerEmbeddedInt.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/Frontend/OpenMP/OMPAssume.h"
 #include "llvm/Frontend/OpenMP/OMPConstants.h"
 #include <set>
 
diff --git a/llvm/include/llvm/Frontend/OpenMP/OMPAssume.h b/llvm/include/llvm/Frontend/OpenMP/OMPAssume.h
new file mode 100644
index 0000000000000..c7462ffe6bc0f
--- /dev/null
+++ b/llvm/include/llvm/Frontend/OpenMP/OMPAssume.h
@@ -0,0 +1,55 @@
+//===- OpenMP/OMPAssume.h --- OpenMP assumption helper functions  - C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// This file provides helper functions and classes to deal with OpenMP
+/// assumptions, e.g., as used by `[begin/end] assumes` and `assume`.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FRONTEND_OPENMP_OMPASSUME_H
+#define LLVM_FRONTEND_OPENMP_OMPASSUME_H
+
+#include "llvm/ADT/StringRef.h"
+
+namespace llvm {
+
+namespace omp {
+
+/// Helper to describe assume clauses.
+struct AssumptionClauseMappingInfo {
+  /// The identifier describing the (beginning of the) clause.
+  llvm::StringLiteral Identifier;
+  /// Flag to determine if the identifier is a full name or the start of a name.
+  bool StartsWith;
+  /// Flag to determine if a directive lists follows.
+  bool HasDirectiveList;
+  /// Flag to determine if an expression follows.
+  bool HasExpression;
+};
+
+/// All known assume clauses.
+static constexpr AssumptionClauseMappingInfo AssumptionClauseMappings[] = {
+#define OMP_ASSUME_CLAUSE(Identifier, StartsWith, HasDirectiveList,            \
+                          HasExpression)                                       \
+  {Identifier, StartsWith, HasDirectiveList, HasExpression},
+#include "llvm/Frontend/OpenMP/OMPKinds.def"
+};
+
+inline std::string getAllAssumeClauseOptions() {
+  std::string S;
+  for (const AssumptionClauseMappingInfo &ACMI : AssumptionClauseMappings)
+    S += (S.empty() ? "'" : "', '") + ACMI.Identifier.str();
+  return S + "'";
+}
+
+} // namespace omp
+
+} // namespace llvm
+
+#endif // LLVM_FRONTEND_OPENMP_OMPASSUME_H
diff --git a/llvm/include/llvm/Frontend/OpenMP/OMPConstants.h b/llvm/include/llvm/Frontend/OpenMP/OMPConstants.h
index c82f8e69b7438..0479e305fcb50 100644
--- a/llvm/include/llvm/Frontend/OpenMP/OMPConstants.h
+++ b/llvm/include/llvm/Frontend/OpenMP/OMPConstants.h
@@ -25,7 +25,6 @@ class Module;
 class ArrayType;
 class StructType;
 class PointerType;
-class StringRef;
 class FunctionType;
 
 namespace omp {
@@ -80,33 +79,6 @@ enum class IdentFlag {
 #define OMP_IDENT_FLAG(Enum, ...) constexpr auto Enum = omp::IdentFlag::Enum;
 #include "llvm/Frontend/OpenMP/OMPKinds.def"
 
-/// Helper to describe assume clauses.
-struct AssumptionClauseMappingInfo {
-  /// The identifier describing the (beginning of the) clause.
-  llvm::StringLiteral Identifier;
-  /// Flag to determine if the identifier is a full name or the start of a name.
-  bool StartsWith;
-  /// Flag to determine if a directive lists follows.
-  bool HasDirectiveList;
-  /// Flag to determine if an expression follows.
-  bool HasExpression;
-};
-
-/// All known assume clauses.
-static constexpr AssumptionClauseMappingInfo AssumptionClauseMappings[] = {
-#define OMP_ASSUME_CLAUSE(Identifier, StartsWith, HasDirectiveList,            \
-                          HasExpression)                                       \
-  {Identifier, StartsWith, HasDirectiveList, HasExpression},
-#include "llvm/Frontend/OpenMP/OMPKinds.def"
-};
-
-inline std::string getAllAssumeClauseOptions() {
-  std::string S;
-  for (const AssumptionClauseMappingInfo &ACMI : AssumptionClauseMappings)
-    S += (S.empty() ? "'" : "', '") + ACMI.Identifier.str();
-  return S + "'";
-}
-
 /// \note This needs to be kept in sync with kmp.h enum sched_type.
 /// Todo: Update kmp.h to include this file, and remove the enums in kmp.h
 ///       To complete this, more enum values will need to be moved here.