bors 14f0942a49 Auto merge of #22532 - pnkfelix:arith-overflow, r=pnkfelix,eddyb
Rebase and follow-through on work done by @cmr and @aatch.

Implements most of rust-lang/rfcs#560. Errors encountered from the checks during building were fixed.

The checks for division, remainder and bit-shifting have not been implemented yet.

See also PR #20795

cc @Aatch ; cc @nikomatsakis
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