make unittest allocator align to 64 bytes.

unit_test/unit_test.h

Index: unit_test/unit_test.h
diff --git a/unit_test/unit_test.h b/unit_test/unit_test.h
index 51e938df818bce3059c697fc06abc1c7ae7be5ae..f2c4bef00182a28bd5d4c9b34b6ce95f6d49be71 100644
--- a/unit_test/unit_test.h
+++ b/unit_test/unit_test.h
@@ -67,9 +67,9 @@ static inline bool SizeValid(int src_width, int src_height,
 #define align_buffer_page_end(var, size)                                       \
   uint8* var;                                                                  \
   uint8* var##_mem;                                                            \
-  var##_mem = reinterpret_cast<uint8*>(malloc((((size) + 4095) & ~4095) +      \
-      OFFBY));                                                                 \
-  var = var##_mem + (-(size) & 4095) + OFFBY;
+  var##_mem = reinterpret_cast<uint8*>(malloc(((size) + 4095 + 63) & ~4095));  \
+  var = (uint8*)((intptr_t)(var##_mem + (((size) + 4095 + 63) & ~4095) -       \
+      (size)) & ~63);
 
 #define free_aligned_buffer_page_end(var) \
   free(var##_mem);  \