Do not fallback to "arm" in rustup-init.sh on aarch64 with 32-bit userland #3488
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On aarch64, neon will not be present in /proc/cpuinfo, instead asimd is there. Previously, we'd fall back to arm when running with a 32-bit userland, even though armv7 is perfectly appropriate in this case.
This would then run into the issue described in rust-lang/rust#58414 with "CP15 barrier emulation".
This PR fixes that.