Convert remaining PREPARE_NONVIRTUAL_CALLSITE call sites to UnmanagedCallersOnly#125697

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copilot/dotnet-123864-replace-prep-nonvirtual-calls

Commits on Mar 18, 2026

Address reviewer feedback: fix bool/byte mismatches, GC holes, and duplicate bstr declaration

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Commits on Mar 19, 2026

Revert RunFinalizers/StartCallback UCO; inline simple VM-only managed helpers

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jkoritzinsky
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