[llvm] [DwarfDump] Add new set of line-table-related statistics to llvm-dwarfdump (PR #93289)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

> Since this is looking at `.debug_line` — have you tested this with both DWARF 4 and DWARF 5 inputs?

I've updated the locstats.ll to test for DWARF versions 2-5; only DWARF version 1 results in a failure, which happens while emitting the object file (presumably because some of the DIExpressions are unsupported).

https://github.com/llvm/llvm-project/pull/93289