[clang] [llvm] Enable fexec-charset option (PR #138895)

[Sergei Barannikov via cfe-commits]

================
@@ -0,0 +1,40 @@
+//===-- clang/Lex/TextEncodingConfig.h - Text Conversion Config -*- 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 LLVM_CLANG_LEX_LITERALCONVERTER_H
----------------
s-barannikov wrote:

Stale include guard

https://github.com/llvm/llvm-project/pull/138895