Tracking issue for migrating from Glacier to compiletest ICE/crash tracking

Tracks the necessary steps to "fully"[^1] transition from rust-lang/glacier to compiletest ICE/crash tracking inside tests/crashes/.
See also this Zulip topic.

Steps

• Implement rustc ICE/crash tracking: #122997
• Implement rustdoc ICE/crash tracking
• Implement rustfmt ICE/crash tracking (questionable)
• Implement ICE/crash tracking via run-make/rmake (to supersede Glacier's shell scripts)
• Archive rust-lang/glacier: rust-lang/team#1459
• Sunset triagebot support for Glacier
  • https://github.com/rust-lang/rust/pull/141427
  • https://github.com/rust-lang/triagebot/pull/2008
• Update the rustc-dev-guide: https://github.com/rust-lang/rustc-dev-guide/pull/2413
  • Remove mentions of Glacier
  • Add small section about tests/crashes/: Overview, rough procedure (adding //@ known-bug, https://github.com/rust-lang/rust/labels/S-bug-has-test)
  • https://github.com/rust-lang/rustc-dev-guide/pull/2588
  • Mention tests/crashes/ in places where we reference https://github.com/rust-lang/rust/labels/E-needs-test (EDIT(fmease): What did I mean by this?)
• Update the Rust Forge
  • Remove mentions of Glacier (namely the triagebot section): https://github.com/rust-lang/rust-forge/pull/856
  • Maybe mention the new system in the issue triaging chapter (EDIT(fmease): The Forge, really?)
• If technically feasible, add a CI check that a PR fixing crash tests mentions all fixed issues via GH auto-close keywords like Fixes to prevent the accumulation of "ghost issues". EDIT(fmease): triagebot nowadays posts a general message if tests/crashes/ has been modified. Doesn't that suffice?

Unresolved Questions

• Should we implement rustdoc support via subdirectories/tests suites (e.g., tests/crashes/rustdoc/) or via a new compiletest directive (e.g., //@ bin: rustdoc)
  • If we do the former, should we move rustc tests from tests/crashes/ to tests/crashes/rustc/?
• Should we define precise procedures for adding new tests to tests/crashes?

[^1]: Glacier|_{rust-lang/rust}, i.e., restriction of Glacier to rust-lang/rust (excluding git submodules/subtrees), i.e., Glacier without support for rustfmt, Cargo, Clippy, Miri ICE/crash tracking

Start by reviewing the remaining checklist items for tests/crashes/, especially rustdoc ICE/crash tracking, run-make/rmake support, and the Rust Forge issue-triaging chapter. Resolve the documented questions about rustdoc subdirectories versus a compiletest directive and procedures for adding tests. Done means the remaining migration steps are completed or explicitly decided.