Allow Rvalue::Repeat to return true in rvalue_creates_operand too
#143720
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The conversation in 143502 made be realize how easy this is to handle, since the only possibilty is ZSTs -- everything else ends up with the destination being `LocalKind::Memory` and thus doesn't call `codegen_rvalue_operand` at all. This gets us perilously close to a world where `rvalue_creates_operand` only ever returns true. I'll try out such a world next :)
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Let `codegen_transmute_operand` just handle everything When combined with #143720, this means `rvalue_creates_operand` can just return `true` for *every* `Rvalue`. (A future PR could consider removing it, though just letting it optimize out is fine for now.) It's nicer anyway, IMHO, because it avoids needing the layout checks to be consistent in the two places, and thus is an overall reduction in code. Plus it's a more helpful building block when used in other places this way. (TBH, it probably would have been better to have it this way the whole time, but I clearly didn't understand `rvalue_creates_operand` when I originally wrote #109843.)
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The conversation in #143502 (comment) made be realize how easy this is to handle, since the only possibilty is ZSTs -- everything else ends up with the destination being
LocalKind::Memoryand thus doesn't callcodegen_rvalue_operandat all.This gets us perilously close to a world where
rvalue_creates_operandonly ever returns true. (See #143860 for more.)