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Use MSBuild MT for bootstrap, ILVerify and determinism - #20793
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Keep bootstrap MT enabled by default without changing product build defaults, and honor explicit MT opt-outs. Preserve the compiler determinism comparisons. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Explicitly enable MSBuild's multithreaded mode for bootstrap, IL verification and determinism builds while preserving explicit MT opt-outs and the existing compiler determinism comparisons.