[release/9.0-staging] [mono][sgen] Add option to disable tarjan gc bridge optimization #121376
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This option is also currently causing crashes in the gc bridge.
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Backport of #121243 to release/9.0-staging
/cc @BrzVlad
Customer Impact
Applications on maui-android can randomly crash during GC. We've had a few fixes for the tarjan bridge merged a few months ago, but there is still one more issue. The problem is caused by a specific optimization inside the tarjan gc bridge. The only workaround for a customer hitting this failure is to configure an environment variable so that their app uses a different gc bridge (which has worse performance). One customer reported that using the older gc bridge makes the application unusable due to degradation of performance. This PR allows users to opt out of a smaller optimization and keep using the tarjan gc bridge, as a workaround for .NET9.
Regression
Testing
Tested on our own gc bridge tests, with scenario causing the issue.
Risk
This PR has zero risk since it just adds support for disabling an optimization. By default, there is no change in behavior. I plan to backport to .NET10 the actual fix for this issue.