Fix GPU destruction when user disabled

GPUs excluded by RVD are not expected to have scratch, memory, trap
handling nor memory regions set up.  Now that these GPUs are added to
a new list, early return on agent destruction to prevent bad function
calls on destroy.

Also fix up broken memory releases between the gpu lists and ugly braces.

Change-Id: I52fc6e86ceba0a0383cedc63310eb409515eaf9f

runtime/hsa-runtime/core/runtime/amd_gpu_agent.cpp

@@ -198,6 +198,8 @@ GpuAgent::GpuAgent(HSAuint32 node, const HsaNodeProperties& node_props, bool xna
 }
 
 GpuAgent::~GpuAgent() {
+  if (!(this)->Enabled()) return;
+
   for (auto& blit : blits_) {
     if (!blit.empty()) {
       hsa_status_t status = blit->Destroy(*this);

runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -204,12 +204,13 @@ void Runtime::RegisterAgent(Agent* agent, bool Enabled) {
     if (Enabled) {
       gpu_agents_.push_back(agent);
       gpu_ids_.push_back(agent->node_id());
-    agents_by_gpuid_[((AMD::GpuAgent*)agent)->KfdGpuID()] = agent;
+      agents_by_gpuid_[((AMD::GpuAgent*)agent)->KfdGpuID()] = agent;
 
       // Assign the first discovered gpu agent as region gpu.
       if (region_gpu_ == NULL) region_gpu_ = agent;
-    } else
+    } else {
       disabled_gpu_agents_.push_back(agent);
+    }
   }
 }
 
@@ -220,7 +221,7 @@ void Runtime::DestroyAgents() {
   gpu_agents_.clear();
 
   std::for_each(disabled_gpu_agents_.begin(), disabled_gpu_agents_.end(), DeleteObject());
-  gpu_agents_.clear();
+  disabled_gpu_agents_.clear();
 
   gpu_ids_.clear();
 
@@ -1397,6 +1398,9 @@ void Runtime::Unload() {
   std::for_each(gpu_agents_.begin(), gpu_agents_.end(), DeleteObject());
   gpu_agents_.clear();
 
+  std::for_each(disabled_gpu_agents_.begin(), disabled_gpu_agents_.end(), DeleteObject());
+  disabled_gpu_agents_.clear();
+
   async_events_control_.Shutdown();
 
   if (vm_fault_signal_ != nullptr) {