[PATCH] systematically provide pv/pvn/pvs/sv quartets

Attached patch provides some new API functions and macros that should
logically exist but haven't so far.  Principally adding pvs versions of
pvn functions.

-zefram

• [PATCH] systematically provide pv/pvn/pvs/sv quartets by Zefram
• Re: [PATCH] systematically provide pv/pvn/pvs/sv quartets by Florian Ragwitz