IVGCVSW-5300 Remove some boost::numeric_cast from armnn/backends

 * Replaced with armnn/utility/NumericCast.hpp
 * Some exclusions in reference backend
 * Excluded as requires float implementation in NumericCast.hpp

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: I9e4e9cd502c865452128fa04415fd6f250baa855
diff --git a/src/backends/backendsCommon/WorkloadUtils.cpp b/src/backends/backendsCommon/WorkloadUtils.cpp
index 37915cf..5886630 100644
--- a/src/backends/backendsCommon/WorkloadUtils.cpp
+++ b/src/backends/backendsCommon/WorkloadUtils.cpp
@@ -6,8 +6,7 @@
 #include <backendsCommon/WorkloadUtils.hpp>
 
 #include <armnn/Utils.hpp>
-
-#include <boost/numeric/conversion/cast.hpp>
+#include <armnn/utility/NumericCast.hpp>
 
 namespace armnn
 {
@@ -194,12 +193,12 @@
 int32_t ConvertMaskToACLFormat(int32_t mask, int32_t numDim)
 {
     int32_t reversedMask = 0;
-    for (unsigned int i = 0; i < boost::numeric_cast<unsigned int>(numDim); ++i)
+    for (unsigned int i = 0; i < armnn::numeric_cast<unsigned int>(numDim); ++i)
     {
         // Check if bit set in mask for each dimension
         int32_t bit = (mask & 1 << i) != 0;
         // Increment the new mask with the bits reversed
-        reversedMask += (bit << std::max(numDim-(boost::numeric_cast<int>(i)+1), 0));
+        reversedMask += (bit << std::max(numDim-(armnn::numeric_cast<int>(i)+1), 0));
     }
 
     return reversedMask;