INVLPG - Invalidate Translation Look-Aside Buffer Entry (486+ only)

	Usage:	INVLPG
	Modifies flags: none

	Invalidates a single page table entry in the Translation
	Look-Aside Buffer.  Intel warns that this instruction may be
	implemented differently on future processors.

				  Clocks		Size
	Operands	 808x	286   386   486		Bytes

	none		  -	 -     -     12		  2

	- timing is for TLB entry hit only.
	- see Instruction Timing