[ILLink] Fix origin for warnings due to event methods #100500
Merged
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Fixes part of #100499. This fixes the warning origin to prevent warnings from being reported on events for annotated event methods. Instead the warning is shown at the location that introduces the dependency on the event.
Doesn't fix the multiple warnings reported in some cases. This is due to MarkEvent also marking event methods, unlike MarkProperty. We might consider fixing this too, but it was looking like a larger change than I wanted to make here.
This removes some spurious warnings that were showing up when bubbling up RUC in winforms.