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Add Arch::virt_is_valid

See merge request !4

All there is left now is AArch64.

Fix possible UB by implementing Copy and Clone manually for BuddyEntry.

See merge request !1

This fixes a warning that may in the future become an error, about the
possibility for unaligned references, since the derive macros apparently
rely on creating references to fields. Unaligned references are direct
UB.