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vp9: Modify usage of force_skip under low temporal variance in non-rd pickmode.

For short_circuit set to level 1, skip newmv for 64x64 blocks if the
low temporal variance flag is set. Also modify threshold for 64x64 split
in variance partitioning.

Overall speed-up on noisy clips of 2-4%.
Only affect speed >= 7.

Change-Id: I384b3772007e84de6f8707e480d2ddf1fe1f907d

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1193,7 +1193,7 @@

     // variance over the sub-32x32 blocks, then force this block to split.

     // Only checking this for noise level >= medium for now.

     if (!is_key_frame && noise_level >= kMedium &&

-        vt.part_variances.none.variance > (5 * avg_32x32) >> 4)

+        vt.part_variances.none.variance > (9 * avg_32x32) >> 5)

       force_split[0] = 1;

     // Else if the maximum 32x32 variance minus the miniumum 32x32 variance in

     // a 64x64 block is greater than threshold and the maximum 32x32 variance is

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1577,8 +1577,10 @@

       continue;

     }

-    if (cpi->sf.short_circuit_low_temp_var >= 2 && force_skip_low_temp_var &&

-        ref_frame == LAST_FRAME && this_mode == NEWMV) {

+    if ((cpi->sf.short_circuit_low_temp_var >= 2 ||

+         (cpi->sf.short_circuit_low_temp_var == 1 && bsize == BLOCK_64X64)) &&

+        force_skip_low_temp_var && ref_frame == LAST_FRAME &&

+        this_mode == NEWMV) {

       continue;

     }