Auto merge of #55871 - ljedrz:llvm_back_allocations, r=nagisa

codegen_llvm_back: improve allocations

This commit was split out from https://github.com/rust-lang/rust/pull/54864. Last time it was causing an LLVM OOM, which was most probably caused by not collecting the globals.

- preallocate vectors of known length
- `extend` instead of `append` where the argument is consumable
- turn 2 `push` loops into `extend`s
- create a vector from a function producing one instead of using `extend_from_slice` on it
- consume `modules` when no longer needed
- ~~return an `impl Iterator` from `generate_lto_work`~~
- ~~don't `collect` `globals`, as they are iterated over and consumed right afterwards~~

While I'm hoping it won't cause an OOM anymore, I would still consider this a "high-risk" PR and not roll it up.

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