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interpret: change ABI-compat test to be type-based This makes the test consistent across targets. Otherwise the chances are very high that ABI mismatches get accepted on x86_64 but still fail on many other targets with more complicated ABIs. This implements (most of) the rules described in https://github.com/rust-lang/rust/pull/115476.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.