Issue 1254 in include-what-you-use: how can I use it in Xcode to detect unused file header

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New issue 1254 by PiggyChen: how can I use it in Xcode to detect unused file header
https://github.com/include-what-you-use/include-what-you-use/issues/1254

I have builded LLVM and Clang by clone the project(https://github.com/llvm/llvm-project), and I successful build include-what-you-use as part of LLVM.
But I am confused how to use the include-what-you-use executable file in my Xcode project to help me detect unused include header file.