Fix yet another Box<T, A> ICE #95328
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Rollup of 5 pull requests Successful merges: - rust-lang#93787 (parallel_compiler: hide dependencies behind feature) - rust-lang#95318 (diagnostics: correct generic bounds with doubled colon) - rust-lang#95328 (Fix yet another Box<T, A> ICE) - rust-lang#95397 (Link to std::io's platform-specific behavior disclaimer) - rust-lang#95407 (Inline u8::is_utf8_char_boundary) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Remove dereferencing of Box from codegen Through rust-lang#94043, rust-lang#94414, rust-lang#94873, and rust-lang#95328, I've been fixing issues caused by Box being treated like a pointer when it is not a pointer. However, these PRs just introduced special cases for Box. This PR removes those special cases and instead transforms a deref of Box into a deref of the pointer it contains. Hopefully, this is the end of the Box<T, A> ICEs.
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Fixes #95036.
This widens the special case from #94414 to make sure that boxes with a custom allocator are never directly dereferenced.