style: [patch 3/22] reduce include dependencies in some headers

Used cppclean to help identify useless includes and removed them. This
involved erroneously included headers, but also cases where forward
declarations could have been used rather than a full include.

src/sim/power/mathexpr_powermodel.hh

@@ -42,11 +42,13 @@
 
 #include <unordered_map>
 
-#include "base/statistics.hh"
 #include "params/MathExprPowerModel.hh"
 #include "sim/mathexpr.hh"
 #include "sim/power/power_model.hh"
-#include "sim/sim_object.hh"
+
+namespace Stats {
+    class Info;
+}
 
 /**
  * A Equation power model. The power is represented as a combination

src/sim/power/power_model.cc

@@ -42,7 +42,7 @@
 #include "base/statistics.hh"
 #include "params/PowerModel.hh"
 #include "params/PowerModelState.hh"
-#include "sim/sim_object.hh"
+#include "sim/clocked_object.hh"
 #include "sim/sub_system.hh"
 
 PowerModelState::PowerModelState(const Params *p)

src/sim/power/power_model.hh

@@ -43,9 +43,10 @@
 #include "base/statistics.hh"
 #include "params/PowerModel.hh"
 #include "params/PowerModelState.hh"
-#include "sim/power/thermal_model.hh"
 #include "sim/probe/probe.hh"
-#include "sim/sim_object.hh"
+
+class SimObject;
+class ClockedObject;
 
 /**
  * A PowerModelState is an abstract class used as interface to get power

src/sim/power/thermal_domain.cc

@@ -44,8 +44,11 @@
 #include "base/statistics.hh"
 #include "debug/ThermalDomain.hh"
 #include "params/ThermalDomain.hh"
+#include "sim/clocked_object.hh"
+#include "sim/linear_solver.hh"
 #include "sim/power/thermal_model.hh"
-#include "sim/sim_object.hh"
+#include "sim/probe/probe.hh"
+#include "sim/sub_system.hh"
 
 ThermalDomain::ThermalDomain(const Params *p)
     : SimObject(p), _initTemperature(p->initial_temperature),

src/sim/power/thermal_domain.hh

@@ -45,11 +45,11 @@
 #include "base/statistics.hh"
 #include "params/ThermalDomain.hh"
 #include "sim/power/thermal_entity.hh"
-#include "sim/probe/probe.hh"
 #include "sim/sim_object.hh"
-#include "sim/sub_system.hh"
 
+class SubSystem;
 class ThermalNode;
+template <class T> class ProbePointArg;
 
 /**
  * A ThermalDomain is used to group objects under that operate under

src/sim/power/thermal_entity.hh

@@ -40,8 +40,7 @@
 #ifndef __SIM_THERMAL_ENTITY_HH__
 #define __SIM_THERMAL_ENTITY_HH__
 
-#include "sim/linear_solver.hh"
-
+class LinearEquation;
 class ThermalNode;
 
 /**

src/sim/power/thermal_model.hh

@@ -42,7 +42,6 @@
 
 #include <vector>
 
-#include "base/statistics.hh"
 #include "params/ThermalCapacitor.hh"
 #include "params/ThermalModel.hh"
 #include "params/ThermalReference.hh"