add SIMD_ALIGNED to unit_test.h

avoids need for row.h for some unittests;

R=harryjin@google.com
BUG=libyuv:594
TESTED=try bots tested.

Review URL: https://codereview.chromium.org/2004313004 .

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1589
+Version: 1590
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1589
+#define LIBYUV_VERSION 1590
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

unit_test/unit_test.h

@@ -22,6 +22,16 @@
 
 #include "libyuv/basic_types.h"
 
+#ifndef SIMD_ALIGNED
+#if defined(_MSC_VER) && !defined(__CLR_VER)
+#define SIMD_ALIGNED(var) __declspec(align(16)) var
+#elif defined(__GNUC__) && !defined(__pnacl__)
+#define SIMD_ALIGNED(var) var __attribute__((aligned(16)))
+#else
+#define SIMD_ALIGNED(var) var
+#endif
+#endif
+
 static __inline int Abs(int v) {
   return v >= 0 ? v : -v;
 }
@@ -31,11 +41,11 @@ static __inline int Abs(int v) {
 // Scaling uses 16.16 fixed point to step thru the source image, so a
 // maximum size of 32767.999 can be expressed.  32768 is valid because
 // the step is 1 beyond the image but not used.
-// Destination size is mainly constrained by valid scale step not the 
+// Destination size is mainly constrained by valid scale step not the
 // absolute size, so it may be possible to relax the destination size
 // constraint.
 // Source size is unconstrained for most specialized scalers.  e.g.
-// An image of 65536 scaled to half size would be valid.  The test 
+// An image of 65536 scaled to half size would be valid.  The test
 // could be relaxed for special scale factors.
 // If this test is removed, the scaling function should gracefully
 // fail with a return code.  The test could be changed to know that