Auto merge of #128913 - saethlin:unignore-debuginfo-tests, r=compiler-errors

Enable debuginfo tests that have been "temporarily disabled" for the past 6 years

The PR history is a bit of a mess because I had to test this a lot with try-jobs, so I'll try to summarize the non-obvious changes here.

A number of tests now have `min-lldb-version: 1800`. Those tests should have gotten an lldb version jump either in rust-lang/rust#124781 or long ago. Note that all such tests with that lldb version requirement do not run in Apple CI.

`tests/debuginfo/drop-locations.rs` is staying disabled for now because gdb doesn't know to stop on the drop calls produced by a `}`: rust-lang/rust#128971

`tests/debuginfo/function-arg-initialization.rs` now has `-Zmir-enable-passes=-SingleUseConsts`; without that we initialize the const before the function prelude: rust-lang/rust#128945

`tests/debuginfo/by-value-non-immediate-argument.rs` fails because we don't generate a function prelude for unused non-immediate arguments, even with all optimizations disabled, and this seems to confuse debuggers on aarch64: rust-lang/rust#128973

`tests/debuginfo/pretty-std.rs` is staying disabled on windows-gnu because our test harness doesn't know how to load our pretty-printers on that target: rust-lang/rust#128981

`tests/debuginfo/method-on-enum.rs` and `tests/debuginfo/option-like-enum.rs` encounter some kind of gdb bug on i686-pc-windows-gnu. I don't know enough about that situation to write a good issue.

I plan on doing more work on this test suite. There's clearly a lot more basic cleanup work to do here.

Author: bors