miri: improve and simplify overflow detection#69002
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bors merged 8 commits intorust-lang:masterfrom Feb 13, 2020
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This simplifies the overflow detection for signed binary operators, and adds overflow detection to unary operators so that const-prop doesn't have to crudely hand-roll that.
It also fixes some bugs in the operator implementation that however, I think, were not observable.
r? @oli-obk @wesleywiser