[clang-tools-extra] [include-cleaner] add fragment header support (PR #189458)

[Daniil Dudkin via cfe-commits]

unterumarmung wrote:

Moved to:
https://github.com/llvm/llvm-project/pull/196766 
https://github.com/llvm/llvm-project/pull/196765 
https://github.com/llvm/llvm-project/pull/196764 
https://github.com/llvm/llvm-project/pull/196763 
https://github.com/llvm/llvm-project/pull/196762 

https://github.com/llvm/llvm-project/pull/189458