[Copilot]

The determinism test rebuilt crossgen2smoke with a global OutputPath override, creating separate MSBuild instances that shared intermediate files. Concurrent writes to helperildll.dll could leave consumers reading incomplete metadata.

• Share the build: Replace the custom MSBuild invocation with a standard ProjectReference.
• Preserve the layout: Copy the three required DLLs into the determinism test’s existing input directory after building, without copying the smoke-test wrapper.

• Fixes Build race condition while building helperildll.dll #135717

[azure-pipelines]

Azure Pipelines:
Successfully started running 3 pipeline(s).
13 pipeline(s) were filtered out due to trigger conditions.
There may be pipelines that require an authorized user to comment /azp run to run.

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/runtime-infrastructure
See info in area-owners.md if you want to be subscribed.