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As Taiki Endo pointed out, there's a problem if we continue using
`target_pointer_width` values to detect an architecture because:
* There are separate `target_arch`s already and
* There is an experimental ABI (not ratified though): RV64ILP32.
cf. <https://lpc.events/event/17/contributions/1475/attachments/1186/2442/rv64ilp32_%20Run%20ILP32%20on%20RV64%20ISA.pdf>
Co-Authored-By: Taiki Endo <te316e89@gmail.com>