Fixed clang-cl errors on Windows native builds.

Partially resolves MLCE-739

Change-Id: Ice06a96d6a8a26b31e334ba4e697cd41d352b026
Signed-off-by: Pablo Tello <pablo.tello@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/7364
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/fixtures/GEMMLowpFixture.h b/tests/validation/fixtures/GEMMLowpFixture.h
index 3da4c02..5fe7d83 100644
--- a/tests/validation/fixtures/GEMMLowpFixture.h
+++ b/tests/validation/fixtures/GEMMLowpFixture.h
@@ -67,13 +67,13 @@
                     max_bound = bounds.second;
                 }
             }
-            std::uniform_int_distribution<int8_t> distribution(min_bound, max_bound);
+            std::uniform_int_distribution<int32_t> distribution(min_bound, max_bound);
             library->fill(tensor, distribution, i);
             break;
         }
         case DataType::QASYMM8:
         {
-            std::uniform_int_distribution<uint8_t> distribution(1, 254);
+            std::uniform_int_distribution<uint32_t> distribution(1, 254);
             library->fill(tensor, distribution, i);
             break;
         }