[libc++abi] Remove empty source file cxa_unexpected.cpp

libcxxabi/src/CMakeLists.txt

@@ -7,7 +7,6 @@ set(LIBCXXABI_SOURCES
   cxa_exception_storage.cpp
   cxa_guard.cpp
   cxa_handlers.cpp
-  cxa_unexpected.cpp
   cxa_vector.cpp
   cxa_virtual.cpp
   # C++ STL files

libcxxabi/src/cxa_unexpected.cpp

@@ -1,22 +0,0 @@
-//===------------------------- cxa_unexpected.cpp -------------------------===//
-//
-// 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 <exception>
-#include "cxxabi.h"
-#include "cxa_exception.h"
-
-namespace __cxxabiv1
-{
-
-extern "C"
-{
-
-}
-
-}  // namespace __cxxabiv1
-

llvm/utils/gn/secondary/libcxxabi/src/BUILD.gn

@@ -30,7 +30,6 @@ cxxabi_sources = [
   "cxa_exception_storage.cpp",
   "cxa_guard.cpp",
   "cxa_handlers.cpp",
-  "cxa_unexpected.cpp",
   "cxa_vector.cpp",
   "cxa_virtual.cpp",