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. #101657 The complete changes for porting are present in this draft PR: #102601 The changes in this PR are intended to update the Architecture entry for LLDB with XCOFF,PPC. 1. Added new ArchitectureType `eArchTypeXCOFF` 2. Added a new `ArchDefinitionEntry g_xcoff_arch_entries[]` 3. Added a new case for `XCOFF in ArchSpec::SetArchitecture(..)` 4. Updated `ArchDefinition *g_arch_definitions[]`