Mateusz Guzik 51ea7bea91 vfs: add VOP_STAT
The current scheme of calling VOP_GETATTR adds avoidable overhead.

An example with tmpfs doing fstat (ops/s):
before: 7488958
after:  7913833

Reviewed by:	kib (previous version)
Differential Revision:	https://reviews.freebsd.org/D25910
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