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This PR is in reference to porting LLDB on AIX. Link to discussions on llvm discourse and github: 1. https://discourse.llvm.org/t/port-lldb-to-ibm-aix/80640 2. https://github.com/llvm/llvm-project/issues/101657 The complete changes for porting are present in this draft PR: https://github.com/llvm/llvm-project/pull/102601 - Added changes to make the common host support functions under `Host/posix` for unix-like system. Also, created the `unittests/Host/posix/` to test the hostInfo & support functions for unix-like system. - Added changes to get the host information for AIX. (GetProcessInfo()) (Information like : executable path, arch, process status etc.)