Fixed compiler error

* Missing noexcept causes compilation to fail on GCC 9.3.0

* Resolves MLCE-595

Change-Id: I960608dbeaacac3699465da4b75740237d65559c
Signed-off-by: Pablo Marquez Tello <pablo.tello@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/6182
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/Size2D.h b/arm_compute/core/Size2D.h
index bcd89cb..f3e9bea 100644
--- a/arm_compute/core/Size2D.h
+++ b/arm_compute/core/Size2D.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2020 Arm Limited.
+ * Copyright (c) 2016-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -41,8 +41,9 @@
      * @param[in] w Width of the image or rectangle
      * @param[in] h Height of the image or rectangle
      */
-    Size2D(size_t w, size_t h)
-        : width(w), height(h)
+    Size2D(size_t w, size_t h) noexcept
+        : width(w),
+          height(h)
     {
     }
     /** The area of the image or rectangle calculated as (width * height)