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20dd693013
rustc_codegen_ssa: use `project_index`, not `project_field`, for array literals. See https://github.com/rust-lang/rust/pull/98615#issuecomment-1170082774 for some context. In short, we were using `project_field` even for array `mir::Rvalue::Aggregate`s, which results in benchmarks like `deep-vector.rs` (and presumably also some real-world usecases?) being impacted by how we handle non-array aggregate fields. (This is a separate PR so that we can measure the perf effects in isolation) r? `@nikic`
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.