Insert veneers on arm64 in cranelift-jit where necessary #12239
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It is a wasmtime specific format that doesn't match what cranelift-jit could register with the system unwinder in the future.
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In preparation for inserting veneers on arm64.
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LGTM! Just one tiny suggestion below.
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Together with an incorrect assertion, the lack of this caused jumps to random memory locations if the target is too far away.
Fixes rust-lang/rustc_codegen_cranelift#1619