rocr: multiple uninitialized and unused variables

Minor modifications to multiple source and header
files based on Coverity report

Change-Id: I4a73d0f56640983c4d5124e13c8c280245cca672
Signed-off-by: Apurv Mishra <apurv.mishra@amd.com>

runtime/hsa-runtime/loader/executable.hpp

@@ -161,7 +161,8 @@ public:
     , is_dynamic_callstack(_is_dynamic_callstack)
     , size(_size)
     , alignment(_alignment)
-    , wavefront_size(_wavefront_size) {}
+    , wavefront_size(_wavefront_size)
+    , debug_info{} {}
 
   ~KernelSymbol() {}