Mara Bos 70a4e433b1
Rollup merge of #79077 - RalfJung:llvm-magic, r=Mark-Simulacrum
document that __rust_alloc is also magic to our LLVM fork

Based on [comments](https://github.com/rust-lang/rust/pull/79045#discussion_r523442198) by ````@tmiasko```` and ````@bjorn3.````
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