[UR] Remove unnecessary null pointer check in OpenCL command buffer code, and update declaration of filter lamba to avoid copies (#17615)

Author: martygrant

unified-runtime/source/adapters/opencl/command_buffer.cpp

@@ -36,8 +36,7 @@ UR_APIEXPORT ur_result_t UR_APICALL urCommandBufferCreateExp(
   ur_queue_handle_t Queue = nullptr;
   ur_queue_properties_t QueueProperties = {UR_STRUCTURE_TYPE_QUEUE_PROPERTIES,
                                            nullptr, 0};
-  const bool IsInOrder =
-      pCommandBufferDesc ? pCommandBufferDesc->isInOrder : false;
+  const bool IsInOrder = pCommandBufferDesc->isInOrder;
   if (!IsInOrder) {
     QueueProperties.flags = UR_QUEUE_FLAG_OUT_OF_ORDER_EXEC_MODE_ENABLE;
   }

unified-runtime/source/common/ur_util.hpp

@@ -270,7 +270,7 @@ inline std::optional<EnvVarMap> getenv_to_map(const char *env_var_name,
     if (map.find(key) != map.end()) {
       map[key].insert(map[key].end(), values_vec.begin(), values_vec.end());
     } else {
-      map[key] = values_vec;
+      map[key] = std::move(values_vec);
     }
   }
   return map;

unified-runtime/source/loader/ur_adapter_registry.hpp

@@ -277,9 +277,9 @@ class AdapterRegistry {
                      [](unsigned char c) { return std::tolower(c); });
 
       if (PositiveFilter) {
-        positiveFilters.push_back({backend, termPair.second});
+        positiveFilters.push_back({std::move(backend), termPair.second});
       } else {
-        negativeFilters.push_back({backend, termPair.second});
+        negativeFilters.push_back({std::move(backend), termPair.second});
       }
     }
 
@@ -294,7 +294,8 @@ class AdapterRegistry {
       for (const auto &device : manifest.device_types) {
         ur_device_tuple single_device = {manifest.backend, device};
 
-        auto matchesFilter = [single_device](const FilterTerm &f) -> bool {
+        const auto matchesFilter =
+            [single_device](const FilterTerm &f) -> bool {
           return f.matches(single_device);
         };