Implementation of RSQRT for quantized int8

Resolves: COMPMID-5863
Change-Id: I9ff67face62826c1d335a6b941e8516be39bdac8
Signed-off-by: Ramy Elgammal <ramy.elgammal@arm.com>
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/c/VisualCompute/ComputeLibrary/+/488768
Tested-by: bsgcomp <bsgcomp@arm.com>
Comments-Addressed: bsgcomp <bsgcomp@arm.com>
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9225
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/reference/ElementwiseUnary.h b/tests/validation/reference/ElementwiseUnary.h
index be4a229..ae7a49b 100644
--- a/tests/validation/reference/ElementwiseUnary.h
+++ b/tests/validation/reference/ElementwiseUnary.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019 Arm Limited.
+ * Copyright (c) 2018-2019, 2023 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -35,7 +35,7 @@
 namespace reference
 {
 template <typename T>
-SimpleTensor<T> elementwise_unary(const SimpleTensor<T> &src, ElementWiseUnary op);
+SimpleTensor<T> elementwise_unary(const SimpleTensor<T> &src, SimpleTensor<T> &dst, ElementWiseUnary op);
 } // namespace reference
 } // namespace validation
 } // namespace test