e3fccdd4a1
Let `rvalue_creates_operand` return true for *all* `Rvalue::Aggregate`s ~~Draft for now because it's built on Ralf's rust-lang/rust#143291~~ Inspired by https://github.com/rust-lang/rust/pull/138759#discussion_r2156375342 where I noticed that we were nearly at this point, plus the comments I was writing in rust-lang/rust#143410 that reminded me a type-dependent `true` is fine. This PR splits the `OperandRef::builder` logic out to a separate type, with the updates needed to handle SIMD as well. In doing so, that makes the existing `Aggregate` path in `codegen_rvalue_operand` capable of handing SIMD values just fine. As a result, we no longer need to do layout calculations for aggregate result types when running the analysis to determine which things can be SSA in codegen.
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