Do anyone successfully change LLVM to local LLVM?

Hi, according to hacking.md and if I understand correctly, developers are able to change LLVM used by k/n to there local LLVM by using -Xllvm-variant.
However, I am fail to do that, more detail in this issue: https://youtrack.jetbrains.com/issue/KT-56054/Native-FAILURE-Build-failed-with-an-exception-after-changing-LLVM .
For any help, thanks for advance!