[clang] [llvm] [AIX][TLS] Disallow the use of -maix-small-local-exec-tls and -fno-data-sections (PR #79252)

[Stefan Pintilie via cfe-commits]

https://github.com/stefanp-ibm approved this pull request.

LGTM
Only one minor nit. 

https://github.com/llvm/llvm-project/pull/79252