[llvm] [LLVM][DWARF] Make some effort to avoid duplicates in .debug_ranges. (PR #106614)

[Kyle Huey via llvm-commits]

khuey wrote:

I think the test needs an `; XFAIL: target={{.*}}-aix{{.*}}` at the top since AIX doesn't support DWARF 5 (specifically the XCOFF code doesn't have any provision for creating the new sections from DWARF 5 such as .debug_rnglists).

https://github.com/llvm/llvm-project/pull/106614