rust/compiler
bors 97a987f14c Auto merge of #142544 - Sa4dUs:prevent-abi-changes, r=ZuseZ4
Prevent ABI changes affect EnzymeAD

This PR handles ABI changes for autodiff input arguments to improve Enzyme compatibility. Fundamentally this adjusts activities when a function argument is lowered as an `ScalarPair`, so there's no mismatch between diff activities and args. Also removes activities corresponding to ZSTs.

fixes: https://github.com/rust-lang/rust/issues/144025

r? `@ZuseZ4`
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