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Rollup merge of rust-lang#87761 - rusticstuff:rustc_error_overflow, r…
…=Mark-Simulacrum Fix overflow in rustc happening if the `err_count()` is reduced in a stage. This can happen if stashed diagnostics are removed or replaced with fewer errors. The semantics stay the same if built without overflow checks. Fixes rust-lang#84219. Background: I came across this independently by running `RUSTFLAGS="-C overflow-checks=on" ./x.py test`. Fixing this will allow us to move on and find further overflow errors with testing or fuzzing.
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