I'm not sure why, but the absence of bitcasts / no-op GEPs causes the branch delay slot to be used. I wanted to double check that this is correct.
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The difference in codegen is rather surprising, but looking at the diffs they are all semantically the same.
Comparing -debug output might explain why the delay slot can be filled now. I recall some issues with debug instructions but that should not be the case here. It's probably not worth investigating though.