Avoid a bitcast FFI call in transmuting #142768
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For things that only change the valid ranges, we can just skip the `LLVMBuildBitCast` call. 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.
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For things that only change the valid ranges, we can just return the input, rather than making the
LLVMBuildBitCastcall 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.