Make pmap_is_prefaultable() more TLB friendly. Specifically, make it use

the kernel's direct map instead of the pmap's recursive mapping to access
the lowest level in the page table.  The direct map is preferable for two
reasons: (1) The TLB is more likely to hold the required direct mapping
because pmap_enter() has already used the direct map to access a nearby
PTE and (2) loading a direct mapping into the TLB involves walking only 2
or 3 levels of the page table instead of 4.

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