Some internal-stats, vp9-highbitdepth bug fixes

Change-Id: I0363d98f6f6558a43276aec48f27dca37c93f5ad
Fix a motion search skip condition in vp9_pick_inter_mode

Compare the current best mode rate-distortion cost with the skip
threshold to decide if performing motion search.

Change-Id: Ia071824f8dd3b7db485f424692a485a2da6a1a9f
Remove redundant rdcost reset

The initial reset of this_rdc in vp9_pick_inter_mode is not needed,
since it will be re-assign when used.

Change-Id: Ic0e12d741cbab292fc214c1eabb48b129af7839b
Merge "Fix a motion search skip condition in vp9_pick_inter_mode"
Merge "Remove redundant rdcost reset"
vp9: fix frame-parallel encoding

the flag in the header wasn't being set based on the encoder
configuration in non-intra only mode

broken since:
fbc2fbf Adding oxcf temp variable.

Change-Id: Ib4cff9901889824bc4e68d7f0f6deb1e41df2f53
Merge "Some internal-stats, vp9-highbitdepth bug fixes"
Merge "vp9: fix frame-parallel encoding"