Adds support for AArch64 SVE to inline assembly

[CrooseGit]

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[rustbot]

rustc_codegen_cranelift is developed in its own repository. If possible, consider making this change to rust-lang/rustc_codegen_cranelift instead.

cc @bjorn3

rustc_codegen_gcc is developed in its own repository. If possible, consider making this change to rust-lang/rustc_codegen_gcc instead.

cc @antoyo, @GuillaumeGomez

[rustbot]

r? @nikomatsakis

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[davidtwco]

r? compiler

[tiif]

r? compiler

[hanna-kruppe]

r? compiler

[davidtwco]

r? @Amanieu

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[Amanieu]

Finally getting around to reviewing this, sorry for the delay.

Why did you choose to make zreg a separate register class from vreg? I feel that the design would be much cleaner if all we did was enable more types to be used with vreg when the sve feature is available.

Other than that detail, the rest of the code mostly looks correct.