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Error when trying to build aarch64 with LLVM 12 and below #15018

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straight-shoota
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Resolves #11358

Code generation for aarch64 is broken with LLVM 12 and below. This patch makes the compiler refuse to generate this code.

@ysbaddaden
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There's a weird error about the UUIDv7 precision, but more importantly: it breaks macos/aarch64 🤕

@straight-shoota
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Oh, I didn't realize this even affects our aarch64-darwin CI environment🤦
Guess we should update LLVM there?

@HertzDevil
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For the record, it looks like disabling FastISel or enabling GlobalISel doesn't actually help

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LLVM bug with StaticArray#sort_by! on aarch64-linux-musl and aarch64-darwin
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