Fix for #5710. OpenCL HOG Object detect assigns the wrong SIMD size.

In oder to guarantee SIMDness between the two compilation steps we choose the
highest SIMD size that is optimized in the kernel for the first step.

modules/objdetect/src/hog.cpp

@@ -1224,7 +1224,7 @@ static bool ocl_normalize_hists(int nbins, int block_stride_x, int block_stride_
     }
     else
     {
-        k.create("normalize_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, "");
+        k.create("normalize_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
         if(k.empty())
             return false;
         if(is_cpu)
@@ -1651,7 +1651,7 @@ static bool ocl_classify_hists(int win_height, int win_width, int block_stride_y
     {
     case 180:
         nthreads = 180;
-        k.create("classify_hists_180_kernel", ocl::objdetect::objdetect_hog_oclsrc, "");
+        k.create("classify_hists_180_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
         if(k.empty())
             return false;
         if(is_cpu)
@@ -1667,7 +1667,7 @@ static bool ocl_classify_hists(int win_height, int win_width, int block_stride_y
 
     case 252:
         nthreads = 256;
-        k.create("classify_hists_252_kernel", ocl::objdetect::objdetect_hog_oclsrc, "");
+        k.create("classify_hists_252_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
         if(k.empty())
             return false;
         if(is_cpu)
@@ -1683,7 +1683,7 @@ static bool ocl_classify_hists(int win_height, int win_width, int block_stride_y
 
     default:
         nthreads = 256;
-        k.create("classify_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, "");
+        k.create("classify_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
         if(k.empty())
             return false;
         if(is_cpu)