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vp9: Set less aggresive short_circuit_low_temp_var for HD at speed 8.

Quality improved by 1.866 and 0.386 for two noisy clips (dark720p and
marcooffice720p), respectively.

Change-Id: Ib33a7672ae9ca53da156208f7cd13f07b5543e44

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -521,6 +521,14 @@

         content != VP9E_CONTENT_SCREEN) {

       // More aggressive short circuit for speed 8.

       sf->short_circuit_low_temp_var = 3;

+      // Use level 2 for noisey cases as there is a regression in some

+      // noisy clips with level 3.

+      if (cpi->noise_estimate.enabled && cm->width >= 1280 &&

+          cm->height >= 720) {

+        NOISE_LEVEL noise_level =

+            vp9_noise_estimate_extract_level(&cpi->noise_estimate);

+        if (noise_level >= kMedium) sf->short_circuit_low_temp_var = 2;

+      }

     }

     sf->limit_newmv_early_exit = 0;

   }