Add log_debug() framework

Signed-off-by: Clifford Wolf <clifford@clifford.at>

kernel/register.cc

@@ -87,6 +87,7 @@ Pass::pre_post_exec_state_t Pass::pre_execute()
 void Pass::post_execute(Pass::pre_post_exec_state_t state)
 {
 	IdString::checkpoint();
+	log_suppressed();
 
 	int64_t time_ns = PerformanceTimer::query() - state.begin_ns;
 	runtime_ns += time_ns;