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There's no guarantee that `ID_AA64ISAR0_EL1` can be read from user-mode, so add to the existing `/proc/cpuinfo` parser instead. See also: - https://www.kernel.org/doc/html/latest/arm64/elf_hwcaps.html - https://developer.arm.com/documentation/100403/0200/register-descriptions/aarch64-system-registers/id-aa64isar0-el1--aarch64-instruction-set-attribute-register-0--el1 - https://elixir.bootlin.com/linux/v5.11.7/source/arch/arm64/kernel/cpuinfo.c#L58 - https://elixir.bootlin.com/linux/v5.11.7/source/arch/arm64/kernel/cpuinfo.c#L66
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