diff --git a/clang/docs/tools/clang-formatted-files.txt b/clang/docs/tools/clang-formatted-files.txt
--- a/clang/docs/tools/clang-formatted-files.txt
+++ b/clang/docs/tools/clang-formatted-files.txt
@@ -3591,7 +3591,6 @@
 lldb/examples/synthetic/bitfield/program.cpp
 lldb/include/lldb/lldb-defines.h
 lldb/include/lldb/lldb-forward.h
-lldb/include/lldb/lldb-private-defines.h
 lldb/include/lldb/lldb-private.h
 lldb/include/lldb/lldb-public.h
 lldb/include/lldb/lldb-versioning.h
diff --git a/lldb/include/lldb/lldb-private-defines.h b/lldb/include/lldb/lldb-private-defines.h
deleted file mode 100644
--- a/lldb/include/lldb/lldb-private-defines.h
+++ /dev/null
@@ -1,36 +0,0 @@
-//===-- lldb-private-defines.h ----------------------------------*- 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
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLDB_LLDB_PRIVATE_DEFINES_H
-#define LLDB_LLDB_PRIVATE_DEFINES_H
-
-#if defined(__cplusplus)
-
-// Include Compiler.h here so we don't define LLVM_FALLTHROUGH and then
-// Compiler.h later tries to redefine it.
-#include "llvm/Support/Compiler.h"
-
-#ifndef LLVM_FALLTHROUGH
-
-#ifndef __has_cpp_attribute
-#define __has_cpp_attribute(x) 0
-#endif
-
-/// \macro LLVM_FALLTHROUGH
-/// Marks an empty statement preceding a deliberate switch fallthrough.
-#if __has_cpp_attribute(clang::fallthrough)
-#define LLVM_FALLTHROUGH [[clang::fallthrough]]
-#else
-#define LLVM_FALLTHROUGH
-#endif
-
-#endif // ifndef LLVM_FALLTHROUGH
-
-#endif // #if defined(__cplusplus)
-
-#endif // LLDB_LLDB_PRIVATE_DEFINES_H
diff --git a/lldb/include/lldb/lldb-private.h b/lldb/include/lldb/lldb-private.h
--- a/lldb/include/lldb/lldb-private.h
+++ b/lldb/include/lldb/lldb-private.h
@@ -11,7 +11,6 @@
 
 #if defined(__cplusplus)
 
-#include "lldb/lldb-private-defines.h"
 #include "lldb/lldb-private-enumerations.h"
 #include "lldb/lldb-private-interfaces.h"
 #include "lldb/lldb-private-types.h"
diff --git a/lldb/include/lldb/module.modulemap b/lldb/include/lldb/module.modulemap
--- a/lldb/include/lldb/module.modulemap
+++ b/lldb/include/lldb/module.modulemap
@@ -134,7 +134,6 @@
   module lldb_enumerations { header "lldb-enumerations.h" export * }
   module lldb_forward { header "lldb-forward.h" export * }
   module lldb_private_enumerations { header "lldb-private-enumerations.h" export * }
-  module lldb_private_defines { header "lldb-private-defines.h" export * }
   module lldb_private_forward { header "lldb-private-forward.h" export * }
   module lldb_private { header "lldb-private.h" export * }
   module lldb_private_interfaces { header "lldb-private-interfaces.h" export * }