[lldb][AIX] Added 32-bit XCOFF Executable support (#139875)
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
**Description:**
Adding support for XCOFF 32 bit file format as well in lldb, up to the
point where 64-bit support is implemented.
Added a new test case for the same.
This is an incremental PR on top of the previous couple of XCOFF support
commits.