Remove unused VOP_POLL().

OK mpi@

struct vops is not modified during runtime so use const which moves each
into read-only data segment.
OK deraadt@ tedu@

zap defines that don't make any sense for us
okay tedu@

bring in a few improvements from pedro, guenther, me...

thanks to krw@ for the original cherry-picking, millert@ for useful comment.

so:
- no longer expose internal kernel addresses, uses seq numbe

bring in a few improvements from pedro, guenther, me...

thanks to krw@ for the original cherry-picking, millert@ for useful comment.

so:
- no longer expose internal kernel addresses, uses seq numbers instead
- make sure the numbers don't overflow (millert@ UINT64_MAX)... a
conservative estimate is that tmpfs will run out of seqs in >600 years...
- don't malloc dents, put them on the stack and zero them
- gc whiteout code
- gc getpage/putpage code (shrink uvm instead)

okay krw@, millert@

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fix include guard locations (from pedro)

sprinkle $OpenBSD$, pointed out by pedro

import tmpfs code, originally from netbsd.
heavy lifting by Pedro Martelletto, timestamp fixes by me.

THIS IS NOT ENABLED YET, AND REQUIRES UVM CHANGES AND REVIEW.
Imported, so that working on it ca

import tmpfs code, originally from netbsd.
heavy lifting by Pedro Martelletto, timestamp fixes by me.

THIS IS NOT ENABLED YET, AND REQUIRES UVM CHANGES AND REVIEW.
Imported, so that working on it can be mostly done in tree with less painful
diff exchanges, and that we have history of further changes.

okay tedu@, deraadt@

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