I have already written my question but I received unclear answer (or I have not understood it), therefore I decided to repeat it.
it is written on the web-page “External Clang Examples” (https://clang.llvm.org/docs/ExternalClangExamples.html) :
“If you know of (or wrote!) a tool or project using Clang, please send an email to Clang’s development discussion mailing list to have it added.”
So, I developed a tool “C++ step instrumenter” (https://github.com/Tkachenko-vitaliy/cppstepin) and I would like to add that reference to the example list.