[llvm] Allow 128-bit discriminants in DWARF variants (PR #125578)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

> I'm incrceasingly suspicious of the fixed-size DIE value, I think with several LEB forms added in DWARFv5 there aren't that many fixed-size DIEs anyway

My memory from a previous discussion with @clayborg is that around half of DIEs were fixed-size. It's the main reason we have multiple fixed-size forms for indexes into .debug_addr, so those references didn't all have to be variable-size. And forms are cheap.

https://github.com/llvm/llvm-project/pull/125578