COMPMID-578: Faster common keypoint validation routine for FAST and Harris corners

Change-Id: I1f3038ccfa6be5e0a19bec11a89af5ed2247c42f
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/119936
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/NEON/HarrisCorners.cpp b/tests/validation/NEON/HarrisCorners.cpp
index b8d7917..3474a96 100644
--- a/tests/validation/NEON/HarrisCorners.cpp
+++ b/tests/validation/NEON/HarrisCorners.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -46,9 +46,9 @@
 namespace
 {
 /* Allowed percentage of keypoints missing for target */
-float allowed_missing_percentage = 10.f;
+const float allowed_missing_percentage = 10.f;
 /* Allowed percentage of keypoints mismatching between target and reference */
-float allowed_mismatch_percentage = 10.f;
+const float allowed_mismatch_percentage = 10.f;
 
 const auto use_fp16 = framework::dataset::make("UseFP16",
 {