[Runtime] Jump stubs appear as `?!?` in ETL traces

[TIHan]

Since we have been analyzing performance on x64 and arm64, one of things that shows up is ?!? which we believe are the jump stubs. The ?!? appears because there is no associated name/dll with the dynamically generated native code.

However, we could fire an ETW event and have perfview recognize it.

Below is an example of ?!?:

cc @davidwrighton

[kunalspathak]

@mangod9 - do you think someone from your team could help?

Cc: @davidwrighton

[mangod9]

@janvorli as well. Just confirming this is only a diagnostics visualization issue and not a perf issue with jump stubs themselves correct?

[TIHan]

Yes, this is just for diagnostic purposes at the moment.

[jkotas]

shows up is ?!? which we believe are the jump stubs.

The Virtual Stub Dispatch stubs show up as ?!? as well.

[janvorli]

There is a bug in PerfView that causes it to ignore some of the messages for stubs and thunks. I have hit that in the past. I have believed I have created an issue for it, but I cannot find it, so apparently, I haven't. I even have a tentative fix in perfview for the issue. I am not sure if it covers all the cases seen in this issue though.