[clang] [clang][ssaf] Implement Entity Linker CLI and patching for JSON Format (PR #184713)

[Aviral Goel via cfe-commits]

aviralg wrote:

Ignore the lit test failure on Windows. They require trivial changes to paths in (Windows uses `/`) expected output. I will fix them after we agree on the implementation details.

https://github.com/llvm/llvm-project/pull/184713