Merge pull request #9074 from alalek:cpu_dispatch_core_hamming

cpu dispatch(core): hamming

modules/core/include/opencv2/core/cv_cpu_dispatch.h

@@ -111,6 +111,12 @@ struct VZeroUpperGuard {
 #define __CV_AVX_GUARD VZeroUpperGuard __vzeroupper_guard; (void)__vzeroupper_guard;
 #endif
 
+#ifdef __CV_AVX_GUARD
+#define CV_AVX_GUARD __CV_AVX_GUARD
+#else
+#define CV_AVX_GUARD
+#endif
+
 #endif // __OPENCV_BUILD