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pc64: no need to flush tlb in kunmap(), was experiment

--- a/sys/src/9/pc64/mmu.c

+++ b/sys/src/9/pc64/mmu.c

@@ -479,7 +479,6 @@

 	if(pte == 0 || (*pte & PTEVALID) == 0)

 		panic("kunmap: va=%#p", va);

 	*pte = 0;

-	mmuflushtlb();

 	splx(x);

 }