Auto merge of #124114 - scottmcm:better-checked, r=workingjubilee

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Make `checked` ops emit *unchecked* LLVM operations where feasible

For things with easily pre-checked overflow conditions -- shifts and unsigned subtraction -- write the checked methods in such a way that we stop emitting wrapping versions of them.

For example, today <https://rust.godbolt.org/z/qM9YK8Txb> neither
```rust
a.checked_sub(b).unwrap()
```
nor
```rust
a.checked_sub(b).unwrap_unchecked()
```
actually optimizes to `sub nuw`.  After this PR they do.

cc #103299

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bors 2024-04-20 04:11:16 +00:00

parent 50075ffced 2ab3444da4

commit 75c38e7bc6

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