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vp9_mcomp,get_cost_surf_min: quiet conversion warning

visual studio will warn if a 32-bit shift is implicitly converted to 64.
in this case integer storage is enough for the result.
since:
f3a9ae5ba Fix ubsan failure in vp9_mcomp.c.

Change-Id: I7e0e199ef8d3c64e07b780c8905da8c53c1d09fc

--- a/vp9/encoder/vp9_mcomp.c

+++ b/vp9/encoder/vp9_mcomp.c

@@ -383,7 +383,7 @@

   const int64_t y0 = cost_list[1] - 2 * (int64_t)cost_list[0] + cost_list[3];

   const int64_t x1 = (int64_t)cost_list[4] - cost_list[2];

   const int64_t y1 = cost_list[4] - 2 * (int64_t)cost_list[0] + cost_list[2];

-  const int64_t b = 1 << (bits - 1);

+  const int b = 1 << (bits - 1);

   *ic = (int)divide_and_round(x0 * b, y0);

   *ir = (int)divide_and_round(x1 * b, y1);

 }