consolidate thread local storage (#915)

* all thread local access now through single struct

* clean up old commented-out code, more use of GET_TLS()

* fewer calls to GET_TLS by passing tls as a funtion argument

* revert unnecessary change to printf

* fix failing tests due to TLS change

* fix merge conflicts in ihipOccupancyMaxActiveBlocksPerMultiprocessor

src/macro_based_grid_launch.inl

@@ -71,7 +71,8 @@ namespace hip_impl
 
             if (COMPILE_HIP_DB && HIP_TRACE_API) {
                 std::string fullStr;
-                recordApiTrace(&fullStr, os.str());
+                GET_TLS();
+                recordApiTrace(tls, &fullStr, os.str());
             }
         }
     }