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adaf340455
Avoid a bitcast FFI call in transmuting For things that only change the valid ranges, we can just return the input, rather than making the `LLVMBuildBitCast` call and having *it* then do nothing. I tried to tweak this a bit more and broke stuff, so I also added some extra tests for that as we apparently didn't have coverage.
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.