Tracking Issue for m68k_target_feature

This is a tracking issue for M68k architecture specific part of https://github.com/rust-lang/rust/issues/44839 (RFC 2045 (rust-lang/rfcs#2045)).
The feature gate for the issue is #![feature(m68k_target_feature)].

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

• Implementation https://github.com/rust-lang/rust/pull/134329
• Stabilization PR (see instructions on rustc-dev-guide)

Unresolved Questions

• isa-68000 is baseline of this architecture, so it may not actually need to be expressed as a target feature.

Implementation history

• isa-*: https://github.com/rust-lang/rust/pull/134329

@rustbot label +O-motorola68k +A-target-feature

Start with RFC 2045, the implementation PR #134329, and the rustc-dev-guide stabilization instructions. Review the unresolved question about whether isa-68000 should be expressed as a target feature. Done means completing the stabilization PR and updating the tracking checklist.