Pragma to ignore -Waggressive-loop-optimizations on Linux ARM64

modules/features2d/src/sift.simd.hpp

@@ -829,10 +829,14 @@ else // CV_8U
         v_pack_store(dst + k, __pack01);
     }
 #endif
+// avoid warning "iteration 7 invokes undefined behavior" on Linux ARM64
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Waggressive-loop-optimizations"
     for( ; k < len; k++ )
     {
         dst[k] = saturate_cast<uchar>(rawDst[k]*nrm2);
     }
+#pragma GCC diagnostic pop
 }
 #else
     float* dst = dstMat.ptr<float>(row);