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I thought that because GoLang has an LLVM backend, that register allocation was handled by LLVM itself?

Go's backend is custom.

They consider LLVM too slow and made their own.

https://github.com/go-llvm/llgo is third party and archived.

gccgo supports dynamic linking and foreign functions, and allegedly generates better-optimized code. The default compiler can share OS threads between goroutines, but not other languages (I guess stacks are no longer segmented but they could be copied?)

After trying Rust for a while, maybe they’re right. One of the reasons I don’t think I could work with Rust is that Go has spoiled me with fast compile times for so long.

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