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Apply a small optimization to pmap_remove_l3_range().  Specifically, hoist a
PHYS_TO_VM_PAGE() operation that always returns the same vm_page_t out of
the loop.  (Since arm64 is configured as VM_PHYSSEG_SPARSE, the
implementation of PHYS_TO_VM_PAGE() is more costly than that of
VM_PHYSSEG_DENSE platforms, like amd64.)

MFC after:      1 week

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