COMPMID-786: Remove all the fill() calls in benchmarks

Filling buffers with random data takes a significant amount of time and in most cases doesn't affect the performance
We will therefore only keep fill() in the functions for which it matters

Change-Id: Ica34fe09941f27d6f0417f33176847febf722bc3
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/115892
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
diff --git a/tests/benchmark/fixtures/GEMMInterleave4x4Fixture.h b/tests/benchmark/fixtures/GEMMInterleave4x4Fixture.h
index 293ceff..793c540 100644
--- a/tests/benchmark/fixtures/GEMMInterleave4x4Fixture.h
+++ b/tests/benchmark/fixtures/GEMMInterleave4x4Fixture.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -59,9 +59,6 @@
         // Allocate tensors
         a.allocator()->allocate();
         b.allocator()->allocate();
-
-        library->fill_tensor_uniform(Accessor(a), 0);
-        library->fill_tensor_uniform(Accessor(b), 1);
     }
 
     void run()