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

[Sergei Barannikov via cfe-commits]

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@@ -1854,23 +1891,58 @@ CharLiteralParser::CharLiteralParser(const char *begin, const char *end,
             HadError = true;
             PP.Diag(Loc, diag::err_character_too_large);
           }
+          if (!HadError && Converter) {
+            assert(isOrdinary() && "Only ordinary characters are supported");
+            std::string UTF8String;
+            convertUTF32ToUTF8String(
+                ArrayRef<char>((const char *)tmp_out_start, 4), UTF8String);
+            auto ErrorOrChar = convertCharacter(UTF8String, Converter);
+            if (ErrorOrChar)
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s-barannikov wrote:

Missing braces

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