Index: clang/include/clang/Basic/OptionUtils.h
===================================================================
--- /dev/null
+++ clang/include/clang/Basic/OptionUtils.h
@@ -0,0 +1,56 @@
+//===- OptionUtils.h - Utilities for command line arguments -----*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  This header contains utilities for command line arguments.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_OPTIONUTILS_H
+#define LLVM_CLANG_BASIC_OPTIONUTILS_H
+
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/LLVM.h"
+#include "llvm/Option/OptSpecifier.h"
+
+namespace llvm {
+
+namespace opt {
+
+class ArgList;
+
+} // namespace opt
+
+} // namespace llvm
+
+namespace clang {
+/// Return the value of the last argument as an integer, or a default. If Diags
+/// is non-null, emits an error if the argument is given, but non-integral.
+int getLastArgIntValue(const llvm::opt::ArgList &Args,
+                       llvm::opt::OptSpecifier Id, int Default,
+                       DiagnosticsEngine *Diags = nullptr);
+
+inline int getLastArgIntValue(const llvm::opt::ArgList &Args,
+                              llvm::opt::OptSpecifier Id, int Default,
+                              DiagnosticsEngine &Diags) {
+  return getLastArgIntValue(Args, Id, Default, &Diags);
+}
+
+uint64_t getLastArgUInt64Value(const llvm::opt::ArgList &Args,
+                               llvm::opt::OptSpecifier Id, uint64_t Default,
+                               DiagnosticsEngine *Diags = nullptr);
+
+inline uint64_t getLastArgUInt64Value(const llvm::opt::ArgList &Args,
+                                      llvm::opt::OptSpecifier Id,
+                                      uint64_t Default,
+                                      DiagnosticsEngine &Diags) {
+  return getLastArgUInt64Value(Args, Id, Default, &Diags);
+}
+
+} // namespace clang
+
+#endif // LLVM_CLANG_BASIC_OPTIONUTILS_H
Index: clang/include/clang/Frontend/Utils.h
===================================================================
--- clang/include/clang/Frontend/Utils.h
+++ clang/include/clang/Frontend/Utils.h
@@ -15,6 +15,7 @@
 
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/LLVM.h"
+#include "clang/Basic/OptionUtils.h"
 #include "clang/Frontend/DependencyOutputOptions.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
@@ -34,12 +35,6 @@
 
 class Triple;
 
-namespace opt {
-
-class ArgList;
-
-} // namespace opt
-
 } // namespace llvm
 
 namespace clang {
@@ -230,29 +225,6 @@
     bool ShouldRecoverOnErrors = false,
     std::vector<std::string> *CC1Args = nullptr);
 
-/// Return the value of the last argument as an integer, or a default. If Diags
-/// is non-null, emits an error if the argument is given, but non-integral.
-int getLastArgIntValue(const llvm::opt::ArgList &Args,
-                       llvm::opt::OptSpecifier Id, int Default,
-                       DiagnosticsEngine *Diags = nullptr);
-
-inline int getLastArgIntValue(const llvm::opt::ArgList &Args,
-                              llvm::opt::OptSpecifier Id, int Default,
-                              DiagnosticsEngine &Diags) {
-  return getLastArgIntValue(Args, Id, Default, &Diags);
-}
-
-uint64_t getLastArgUInt64Value(const llvm::opt::ArgList &Args,
-                               llvm::opt::OptSpecifier Id, uint64_t Default,
-                               DiagnosticsEngine *Diags = nullptr);
-
-inline uint64_t getLastArgUInt64Value(const llvm::opt::ArgList &Args,
-                                      llvm::opt::OptSpecifier Id,
-                                      uint64_t Default,
-                                      DiagnosticsEngine &Diags) {
-  return getLastArgUInt64Value(Args, Id, Default, &Diags);
-}
-
 // Frontend timing utils
 
 /// If the user specifies the -ftime-report argument on an Clang command line
Index: clang/lib/Basic/CMakeLists.txt
===================================================================
--- clang/lib/Basic/CMakeLists.txt
+++ clang/lib/Basic/CMakeLists.txt
@@ -55,6 +55,7 @@
   ObjCRuntime.cpp
   OpenMPKinds.cpp
   OperatorPrecedence.cpp
+  OptionUtils.cpp
   SanitizerBlacklist.cpp
   SanitizerSpecialCaseList.cpp
   Sanitizers.cpp
Index: clang/lib/Basic/OptionUtils.cpp
===================================================================
--- /dev/null
+++ clang/lib/Basic/OptionUtils.cpp
@@ -0,0 +1,44 @@
+//===--- OptionUtils.cpp - Utilities for command line arguments -----------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/OptionUtils.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticDriver.h"
+#include "llvm/Option/ArgList.h"
+
+using namespace clang;
+using namespace llvm::opt;
+
+template <typename IntTy>
+static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
+                                    IntTy Default, DiagnosticsEngine *Diags) {
+  IntTy Res = Default;
+  if (Arg *A = Args.getLastArg(Id)) {
+    if (StringRef(A->getValue()).getAsInteger(10, Res)) {
+      if (Diags)
+        Diags->Report(diag::err_drv_invalid_int_value)
+            << A->getAsString(Args) << A->getValue();
+    }
+  }
+  return Res;
+}
+
+namespace clang {
+
+// Declared in clang/Frontend/Utils.h.
+int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
+                       DiagnosticsEngine *Diags) {
+  return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
+}
+
+uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
+                               uint64_t Default, DiagnosticsEngine *Diags) {
+  return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
+}
+
+} // namespace clang
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -3682,35 +3682,8 @@
   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
 }
 
-template<typename IntTy>
-static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
-                                    IntTy Default,
-                                    DiagnosticsEngine *Diags) {
-  IntTy Res = Default;
-  if (Arg *A = Args.getLastArg(Id)) {
-    if (StringRef(A->getValue()).getAsInteger(10, Res)) {
-      if (Diags)
-        Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
-                                                       << A->getValue();
-    }
-  }
-  return Res;
-}
-
 namespace clang {
 
-// Declared in clang/Frontend/Utils.h.
-int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
-                       DiagnosticsEngine *Diags) {
-  return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
-}
-
-uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
-                               uint64_t Default,
-                               DiagnosticsEngine *Diags) {
-  return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
-}
-
 IntrusiveRefCntPtr<llvm::vfs::FileSystem>
 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
                                 DiagnosticsEngine &Diags) {