Clang: File with BOM leads to: expected "FILENAME" or <FILENAME>

libclang has problems to process files with BOM:

1. Create and open a file like foo.cpp below.
2. A diagnostic fatal error: 'someNonExistingFile.h' file not found will be indicated, as expected.
3. From the context menu of the editor, choose "Add UTF-8 BOM on Save", then insert a space and hit Ctrl+S to save with the BOM.
4. Close and re-open the file. The diagnostic error: expected "FILENAME" or <FILENAME> (Lexical or Preprocessor Issue) will be indicated.
5. Insert some space --> this diagnostic is gone and the correct one from Step 2 is displayed again.

#include <someNonExistingFile.h.h>

int main() { return 0; }