Fix overflow in rustc happening if the `err_count()` is reduced in a stage.#87761

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bors merged 1 commit intorust-lang:masterfrom

rusticstuff:rustc_error_overflow

Aug 6, 2021

Commits on Aug 4, 2021

Fix overflow in rustc happening if the `err_count()` is reduced in a stage.
hkratz
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