Tracking Issue for immediately-aborting panics (currently -Cpanic=immediate-abort)

This is a tracking issue for the unstable panic strategy -Cpanic=immediate-abort, whose goal is to optimize for size, by not doing any panic message formatting or calling panic hooks, and perhaps exposing new optimizations along the way.

About tracking issues

Tracking issues are used to record the overall progress of implementation.
They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions.
A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature.
Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.
Discussion comments will get marked as off-topic or deleted.
Repeated discussions on the tracking issue may lead to the tracking issue getting locked.

Steps

• Select a name?
• Declare stabilization?

Unresolved Questions

• What should this flag be called?

Implementation history

https://github.com/rust-lang/rust/pull/55011
https://github.com/rust-lang/rust/pull/91737
https://github.com/rust-lang/rust/pull/104999
https://github.com/rust-lang/rust/pull/108924
https://github.com/rust-lang/rust/pull/117332
https://github.com/rust-lang/rust/pull/118362
https://github.com/rust-lang/rust/pull/129589
https://github.com/rust-lang/rust/pull/146317

Start by reviewing the implementation history in PRs #55011, #91737, #104999, #108924, #117332, #118362, #129589, and #146317, then read the linked stabilization guide. The tracking issue is complete when the flag has a selected name and stabilization has been declared.