[SYCL][ESIMD] Add lsc_prefetch_2d tests (#1645)

Author: fineg74

SYCL/ESIMD/lsc/lsc_load_store_2d_compare.cpp

@@ -71,9 +71,13 @@ int main() {
 
       config_2d_mem_access<float, BlockWidth, BlockHeight, NumBlocks> payload(
           A, width, height, pitch, 0, 0);
+      lsc_prefetch_2d<float, BlockWidth, BlockHeight, NumBlocks, false, false,
+                      cache_hint::cached, cache_hint::cached>(payload);
       auto data_a = lsc_load_2d(payload);
 
       payload.set_data_pointer(B);
+      lsc_prefetch_2d<float, BlockWidth, BlockHeight, NumBlocks, false, false,
+                      cache_hint::cached, cache_hint::cached>(payload);
       auto data_b = lsc_load_2d(payload);
 
       auto data_c = data_a + data_b;

SYCL/ESIMD/lsc/lsc_load_store_2d_smoke.cpp

@@ -62,7 +62,9 @@ int main() {
                 payload(input, (SurfaceWidth * sizeof(int)) - 1,
                         SurfaceHeight - 1, (SurfacePitch * sizeof(int)) - 1, x,
                         y);
-
+            lsc_prefetch_2d<int, BlockWidth, BlockHeight, NumBlocks, false,
+                            false, cache_hint::cached, cache_hint::cached>(
+                payload);
             auto data = lsc_load_2d(payload);
 
             payload.set_data_pointer(block_store);