Cache Hardware.is_64_bit?
Cache Hardware.is_64_bit?

IO#popen is called for each call to Hardware.is_64_bit?; this becomes
costly when it is repeatedly invoked. Luckily it is an invariant, so we
can store it in a class variable.

False is a valid value for this method, so the usual ||= idiom is not
applicable.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

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