Rollup merge of #117910 - madsmtm:msg-send-no-clashing, r=thomcc

Refactor uses of `objc_msgSend` to no longer have clashing definitions

This is very similar to what Apple's own headers encourage you to do (cast the function pointer before use instead of making new declarations).

Additionally, I'm documenting a few of the memory management rules we're following, ensuring that the `args` function doesn't leak memory (if you wrap it in an autorelease pool).

Motivation is to avoid issues with clashing definitions, like described in https://github.com/rust-lang/rust/issues/12707#issuecomment-1570735643 and https://github.com/rust-lang/rust/issues/46188#issuecomment-1288058453, CC ``@bjorn3.``

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