Tracking Issue for -Zdirect-access-external-data

[ojeda]

This is a tracking issue for the -Zdirect-access-external-data flag for LoongArch.

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

• MCP: Add -Z direct-access-external-data compiler-team#707.
• Implementation: Add unstable -Z direct-access-external-data cmdline flag for rustc #119162 (1.78).
• Adjust documentation (see instructions on rustc-dev-guide)
• Stabilization PR (see instructions on rustc-dev-guide)