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Fix libvpx VP9 decoder dr memory errors

Fixed dr memory errors reported in Issue 736:
https://code.google.com/p/webm/issues/detail?id=736

All elements in left_col buffer need to be initialized to ensure
the correctness of SIMD operations in x86 optimized code.

Change-Id: I8e7f26ab45cca8099c1f9342bcf852f828bda7e4

--- a/vp9/common/vp9_reconintra.c

+++ b/vp9/common/vp9_reconintra.c

@@ -347,6 +347,8 @@

   x0 = (-xd->mb_to_left_edge >> (3 + pd->subsampling_x)) + x;

   y0 = (-xd->mb_to_top_edge >> (3 + pd->subsampling_y)) + y;

+  vpx_memset(left_col, 129, 64);

+

   // left

   if (left_available) {

     if (xd->mb_to_bottom_edge < 0) {

@@ -366,8 +368,6 @@

       for (i = 0; i < bs; ++i)

         left_col[i] = ref[i * ref_stride - 1];

     }

-  } else {

-    vpx_memset(left_col, 129, bs);

   }

   // TODO(hkuang) do not extend 2*bs pixels for all modes.