Merge pull request #28686 from Lurie97:fix_inplace

core(opencl): fix inplace transpose race by enforcing LLSS ordering via local barrier #28686

The former inplace transpose implementation allowed a reordering of global-memory operations across work-items. Specifically, the intended LLSS (Load–Load–Store–Store) access pattern could be reordered by the GPU into LSLS (Load–Store–Load–Store), causing partially written tiles to be observed by other work-items and producing incorrect output.

This patch introduces a tiled LDS-based algorithm and adds an explicit:

    barrier(CLK_LOCAL_MEM_FENCE);

between the load and store phases.

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [ ] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/core/src/matrix_transform.cpp

@@ -465,10 +465,16 @@ static bool ocl_transpose( InputArray _src, OutputArray _dst )
             return false;
     }
 
+    String deviceMacro;
+    if (dev.isIntel())
+        deviceMacro = " -D INTEL_GPU";
+    else
+        deviceMacro = "";
+
     ocl::Kernel k(kernelName.c_str(), ocl::core::transpose_oclsrc,
-                  format("-D T=%s -D T1=%s -D cn=%d -D TILE_DIM=%d -D BLOCK_ROWS=%d -D rowsPerWI=%d%s",
+                  format("-D T=%s -D T1=%s -D cn=%d -D TILE_DIM=%d -D BLOCK_ROWS=%d -D rowsPerWI=%d%s%s",
                          ocl::memopTypeToStr(type), ocl::memopTypeToStr(depth),
-                         cn, TILE_DIM, BLOCK_ROWS, rowsPerWI, inplace ? " -D INPLACE" : ""));
+                         cn, TILE_DIM, BLOCK_ROWS, rowsPerWI, inplace ? " -D INPLACE" : "", deviceMacro.c_str()));
     if (k.empty())
         return false;