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Experimental change to help with ARNR problem.

Allow use of other reference frames for the ARF overlay frame
when ARNR filtering is enabled

Change-Id: Icd6a9fb38977a88fbe7cc9b9c18198eb454c0273

--- a/vp8/encoder/rdopt.c

+++ b/vp8/encoder/rdopt.c

@@ -1849,7 +1849,10 @@

         x->e_mbd.mode_info_context->mbmi.uv_mode = DC_PRED;

         x->e_mbd.mode_info_context->mbmi.ref_frame = vp8_ref_frame_order[mode_index];

-        //Only consider ZEROMV/ALTREF_FRAME for alt ref frame.

+        // Only consider ZEROMV/ALTREF_FRAME for alt ref frame,

+        // unless ARNR filtering is enabled in which case we want

+        // an unfiltered alternative

+        //if (cpi->is_src_frame_alt_ref && (cpi->oxcf.arnr_max_frames > 0))

         if (cpi->is_src_frame_alt_ref)

         {

             if (this_mode != ZEROMV || x->e_mbd.mode_info_context->mbmi.ref_frame != ALTREF_FRAME)