FreeBSD/src 61f67f3 (r355791)sys/tools vnode_if.awk

vfs: allow tail call optimisation in vops in the common case

Most frequently used vops boil down to checking SDT probes, doing the call and
checking again. There is no vop_post/pre in their case but the check after the
call prevents tail call optimisation from taking place. Instead, check once
upfront. Kernels with debug or vops with non-empty vop_post still don't short
circuit.

Reviewed by:    kib
Tested by:      pho
Differential Revision:  https://reviews.freebsd.org/D22739
DeltaFile
+11-7sys/tools/vnode_if.awk
+11-71 files

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