[clang] [Clang] Pass -fseparate-named-sections from the driver (PR #91567)

[Peter Smith via cfe-commits]

https://github.com/smithp35 commented:

Code change LGTM.

Although currently trivial, would it be worth adding a Driver test for it. Something like https://github.com/llvm/llvm-project/blob/main/clang/test/Driver/funique-internal-linkage-names.c  

https://github.com/llvm/llvm-project/pull/91567