[llvm] [llvm][ELF] Add statistics on various section sizes (PR #102363)

[Reid Kleckner via llvm-commits]

https://github.com/rnk approved this pull request.

Neat. Can you pick some LLVM object file of interest, say X86ISelLowering.cpp.o, and paste the stats output for that file, just to get a sense of what the data looks like?

I think this looks good, but I'd like a second reviewer opinion.

https://github.com/llvm/llvm-project/pull/102363