LLVM 19 changes debuginfo text representation breaking at least 4 tests

[durin42]

Caught by our buildkite. Looking at the commits in the breaking range, I'm pretty confident this is llvm/llvm-project@91446e2 changing things, so it's expected.

failures:
  | [codegen] tests/codegen/debuginfo-constant-locals.rs
  | [codegen] tests/codegen/debug-fndef-size.rs
  | [codegen] tests/codegen/inline-debuginfo.rs
  | [codegen] tests/codegen/sroa-fragment-debuginfo.rs
 
Hopefully we'll get to a fix for this in the near future, but the changes look like they might be irritating to handle. There's some guidance in the LLVM change which may help, but I didn't dig today.

[workingjubilee]

Fixed in #124830.