LSRA: Consider a stress mode that trashes registers

[CarolEidt]

The issue https://github.com/dotnet/coreclr/issues/18943 is a case where it appears a register is being incorrectly copied to the wrong register before its intended use. If we had a COMPlus_JitStressRegs mode that would write some trash value to each register when it goes dead, a case like this might have been caught.

category:implementation
theme:register-allocator
skill-level:beginner
cost:small

[dotnet-policy-service]

Due to lack of recent activity, this issue has been marked as a candidate for backlog cleanup. It will be closed if no further activity occurs within 14 more days. Any new comment (by anyone, not necessarily the author) will undo this process.

This process is part of our issue cleanup automation.

[dotnet-policy-service]

This issue will now be closed since it had been marked no-recent-activity but received no further activity in the past 14 days. It is still possible to reopen or comment on the issue, but please note that the issue will be locked if it remains inactive for another 30 days.