[clang-tools-extra] [libc] [clang] [lldb] [libcxx] [flang] [compiler-rt] [llvm] [PowerPC] Support mcmodel=small/large for AIX (PR #70652)

[Qiu Chaofan via llvm-commits]

ecnelises wrote:

https://github.com/llvm/llvm-project/issues/71356 to track SPE issue

https://github.com/llvm/llvm-project/pull/70652