llvm_asm has been removed

[bergwolf]

llvm_asm has been removed in rust-lang/rust#92816 and the crate no longer compiles with the latest nightly.

[XuShaohua]

It was replaced. Thx.

[XuShaohua]

Unlike llvm_asm!, asm! is only available on x86 and arm platforms (and risc-v), so the C shim code is used on other architectures in rust nightly.