[Proposal]: Do not require fixing a fixed field of a ref struct

[jaredpar]

Do not require fixing a fixed field of a ref struct

• Specification:
• Discussion: Do not require fixing a fixed field of a ref struct #9014

Summary

A fixed statement should not be required on a fixed field of a ref struct, because it is never moveable.

Note for future LDM consideration: there is a bug tail involved with any fixed change. While this is probably not worth it on it's own merits, if we have other fixed work that result in refactoring this would be worth it at that point.

Design meetings