IVGCVSW-2454 Merge together the pluggable backends work (was in a
separate branch) and master

 * Brings in all the changes done for the pluggable backends
 * Added sub-graph support and tests
 * Added precompiled layer support and tests
 * Moved BackendSettings to a separate file
 * Removed the backend-specific code
 * Ported DebugLayer and associated functionality
 * Included fixes to make those changes work with master

Change-Id: Id7028fa7917527b844628d5aff5732e3d94c0488
diff --git a/src/backends/backendsCommon/WorkloadData.cpp b/src/backends/backendsCommon/WorkloadData.cpp
index a5db088..97981e2 100644
--- a/src/backends/backendsCommon/WorkloadData.cpp
+++ b/src/backends/backendsCommon/WorkloadData.cpp
@@ -1051,4 +1051,9 @@
                               "output");
 }
 
+void PreCompiledQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
+{
+    // This is internally generated so it should not need validation.
+}
+
 } //namespace armnn