vpx_dsp/get_prob: make clip_prob branchless

+ inline the function directly as there was only one consumer

this is an attempt to reduce the amount of branches to workaround an amd
bug. this change is mildly faster or neutral across x86-64, arm.

665 Integer Divide Instruction May Cause Unpredictable Behavior


Suggested-by: Pascal Massimino <pascal.massimino@gmail.com>
Change-Id: Ia91823aded79aab469dd68095d44300e8df04ed2
(cherry picked from commit 7481edb33f5ea82e29f12e0e872d04ea1a5373cb)
1 file changed