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use a compile time constant for kDataAlignment

const or constexpr should be sufficient for this use but older
versions of gcc fail to expand DECLARE_ALIGNED correctly. Work
around this by using an enum.

Fixed: webm:1660
Change-Id: Ifa4f7585417760f90f9fb28332152019de9f8169

--- a/test/sad_test.cc

+++ b/test/sad_test.cc

@@ -116,7 +116,10 @@

  protected:

   // Handle blocks up to 4 blocks 64x64 with stride up to 128

-  static const int kDataAlignment = 32;

+  // crbug.com/webm/1660

+  // const[expr] should be sufficient for DECLARE_ALIGNED but early

+  // implementations of c++11 appear to have some issues with it.

+  enum { kDataAlignment = 32 };

   static const int kDataBlockSize = 64 * 128;

   static const int kDataBufferSize = 4 * kDataBlockSize;